I'd say #1 because I am personally trapped there while peeing. I don't have to have any physical contact with the nasty no-hand-washer.
A public bathroom is a place people go to let loose and pop a squat. If farting noises bother someone when they are pissing than GTFO of the bathroom and get your ass in the girls room Ahhhh the glory daze of having a colon. When farts were a dime a dozen.
#3, without a doubt. I've seen people I work with do it. I report them every time. (They handle food)
But you seemed to have so much fun last time you used the urinal. [video=youtube;3MHtx1nwFow]http://www.youtube.com/watch?v=3MHtx1nwFow[/video]