i would think
a booth where one pays a small fee to empty their bladder

but this works! woo!
( Agent Muu b3ta.com/links/Morph_Meets_Mofahas_Monster, Wed 30 Apr 2008, 23:05, archived)

I just found the bathos of this concept to be funnier :P

( hexachordal GO SPORT, Wed 30 Apr 2008, 23:06, archived)