What a great idea – instead of having a conventional urinal, make one out of a mirror in the hall of mirrors. Then, when people (gents) use the gents, they’ll have minutes of fun playing with their pink oboes, which will be distorted and turned into pink bassoons, or pink tubas.
When leaving the bar, discover that there is no such mirror in the ladies lavatory. Instead there are video screens. The miracle of closed-circuit television allows the ladies in the ladies to watch the gents in gents and the look of amusements on theri face as they play John Holmes in the mirror.