When I was a child, I rigged a squirt gun to a doorknob with the door ajar and the stings very visible, so that it was obvious that opening the door would not make the quirt gun work. My oldest brother say it and he laughed and told me it wouldn't work, and then to demonstrate that it would not work he opened the door and stepped into eh doorway... only to have a large stuffed animal that was propped on top of the door fall on his head.

He then had me set it up again and led each of our other siblings to fall for the same distraction of the string and the squirt gun.

before april fools day I announced online that I had convinced 20 people to meet me at times square by the benches for a date and you could view these 20 guys holding up signs asking for Jenny. I would further add to this various pizze deliverers. That it would be my greatest prank ever.

A few hours later I went back to the various sites where everyone was talking about how they didnt see anything and told them "happy april fool's day, fools"

It was my finest moment as a joker.

Once I dated a woman who worked as a waitress in a local restaurant which I frequented more than twice a week as it was near to my place of work. One lunchtime I arrived at the restaurant and there was only one table available. No sooner had I sat down than my girlfriend appeared and asked me what I would like to order. Smiling, I asked her in a loud voice if she would like to see my new balls.
There ensued a momentary silence in which you could have heard a feather drop. Quick as flash I produced two Chinese Metal Balls, which, are used for the purpose of exercise. A few people broke into loud laughter and one or two looked glaringly at me. If nothing else it demonstrated how quickly people where keen to make snap judgements without waiting to hear or see what follows next.

Sadly not mine. But while at high school we had a very very strict principal. He was a terror never without his cane. And he would use it freely. 200 kids at this school, so disciple was necessary and I have a lot of respect for this guy, tough as he was, he stood up for me when my parents took me out of school. He would give an assembly speech each morning, from a balcony one story up, microphone loudspeakers the works. He would usually get fired up lean out the window yelling and waving a cane. My class was "special" we didn't have to do some of the compulsory things like P.E., music sport and such due to our heavy load of sciences and maths. But, we were also non conformists and not easy to manage. So a plan was hatched. One morning at assembly, the principle was in full swing, yelling off the balcony, grabbed his cane and started waving it around. Large glitter covered star included. The cane stood in a box where he gave speeches from, one of the guys took one, made a big star, all gold and glittery and replaced it in the box, star down and unseen. His nick name was hitler so a few of us yelled, "heil Tinkerbell". Teachers just lost it, principle went off he tree, knew who the likely culprits were, hauled us up, ranted and raves and then admitted it was very funny.

In Crete I was CMS Custodian. In change of all cryptographic equipment. I relieved my RMC on that job because he was retiring. Last couple weeks he didn't help me at all, everything was "look it up". My OIC asked me to make a message cancelling his retirement for April fools day. he was leaving the island April 4th on retirement. I drafted a message that not even the Chief of Naval Operations of the United States Navy could find bogus. References of messages, addressed involved everything, I even referenced visit of our Commanding Officer that came from Sigonella the week before and subsequent phone calls with RM detailers. The message was in the screen of my PC if he will have helped me just once he will have seen the message but no... April Fool was a Saturday. The OIC called him early in the morning to the barracks to come to the Comm Center... Everybody came and hide behind a curtain... OIC received him and brought him to that room... He said handing him the message ran internally thru radio channels... I like to give bad news personally and quick I am so sorry I just received this message cancelling your orders of retirement. Postponed for 6 months. You got 6 more months in the island. RMC looked at him, saw the message and started crying saying "I knew it, I knew it, the commanding officer didn't even wanted to look at me when she came, I knew something was up... I just can not believe she did this to me buaa" My OIC got panicked because it was bad... so bad that he just opened the curtain. And everybody screamed "April Fool" He look at everybody and went on his knees. At that time thanking god he look up and noticed I was not there. He screamed I know the only "dirtbag son of a bitch" that could do something like this. Oh I am going to kill him. He didn't kill me but didn't even wanted to shake my hands at departure day... and told me If I ever see you in Jacksonville I am going to run my car over you. So I made a grown up man cry, but I gave him opportunity to find the message in the screen if he would had help me a little. That is my gold medal of practical joke on April Fool.

Oh man. My best was in high school. We knew when the teacher was doing frog dissection so...natrually...we formulated a plan. On dissection day I carried our plan to the dissection table. We prepped and yelled "it moved!" Of course many laughed at our ridiculous claim until I tapped our imposter frog and he leaped 10in forward. Our teacher stood in awe saying "not possible" until finally we displayed the dead frog. As you can see, a proud moment in my life.

I'll start: this one makes some people mad. We moved 4 blocks of no parking signs over one street in the middle of the night when they were going to start doing construction work on that road. The workers didn't notice the move, and ended up working on the road we 'no parked'. Sorry about your tax dollars. And mine.