Water at restaurants? I don't think it's unfounded, but some might find it ridiculous.
Bees. I've been known to literally run away from them. Just hearing the familiar buzz is enough to make my hair stand on end. Hell, just THINKING about that familiar buzz sound makes my hair stand on end.
When I was a kid I had very irrational fear of large bodies of water and as a result I never learned how to swim.
I have a fear of being laughed at or ridiculed. Funny thing is, I have been both laughed at and ridiculed and I just rolled with it. So its really only a fear in MY mind.
Banjos
Good lord, man; what did a banjo ever do to you?
Sharkphobia...LOL
At 4 y/o I asked if at the bottom of the Patagonian's rivers (which are crystal clear) sharks were swimming. My "adorable 18 y/o sister" placed my head under water for an eternity to show me no sharks were around. Since them I don't swim with my head under the water. LOL
"What has been seen, cannot be unseen."
Fear of answering such questions. I find them almost pathologically offensive.