Whole-heartedly agree with the earlier post about toilet etiquette!
I sometimes get 'stagefright'... not sure why and doesn't happen very often, but bloody annoying when it does. Definately the most memorable occassion occured towards to the end of a drunken night out at university. I came back to my house, drunk and absolutely busting, only to find our only toilet (in the bathroom) occupied. After around 5 minutes of repeated bashing on the door, said door opens. I am met by the sight of my housemate, stark bollock naked, covered in soap suds, and clearly aroused...
Behind him, in the bath, was a young lady - equally naked and covered in soaps suds. (unsure about the nature of her arousal - not so easy to tell with yer girl in that situation, but she was slightly flushed if that helps).
My mate ushers me in and tells me to be quick, so in I go. I don't know if it was the fact my mate was now standing behind me tapping his foot and obviously not pleased or the sight of this (good looking) girl gyrating around in the bath, clearly not abashed, but could I wee?? Could I hell.
The walk of shame was deafining - so was, ironically, the sound of the bathroom door closing after I left...