I don't have a shy bladder. I can, more or less, pee on command.
A few hours ago, I found myself standing next to a stranger in the bathroom, pants unzipped, "Tiny-Taylor" in hand, ready to go, and then a booming, inappropriately loud, voice filled the room.
"Where is this rain we're supposed to get?!?!" December and May are supposed to be the wettest months but I don't see it!"
"God?" I thought, "This is a weird time to choose to speak,"
...but then I realized it was just the stranger next to me. I wanted to be friendly, I really did, but all of a sudden I realized that I couldn't pee, I was so unnerved by this unexpected conversation. It took every ounce of concentration to force the liquid from my loins, and so my only contribution to our discourse was, "....yep."
Sorry, guy. I'm usually much friendlier, but then I usually don't meet new people while holding my penis.