Something like, "Soooo...you're letting the one eyed snake out of its cage awhile?"
"Did your zipper break or are you just airing that thing out?"
"A penis is like a religion...some people have them but most feel no need to share it with everyone"
Vocal volume dependent on current company, of course, but I'm not known for my subtlety.
That is a good question. I go to a local hot spring and there is an elderly gentleman that always has part of his junk hanging below the hem of his swim shorts. It seems like that is something a guy would notice but he does not seem like a freak in other ways
My zippers have a mind of their own. However for a woman wanting to strike up a conversation with a man, it's a good pick-up line. But if a man should tell me, I'd probably wonder why he noticed. Personally I have never looked at a man's zipper. Nada, not once.