as well as an odd place to take a crap.
There's a chain of delis in Oklahoma City that has one way mirrors at the urinals. You piss looking out at the dining room. It's fun to take someone there for the first time and when they go to the bathroom wait a sufficient amount of time for them to whip it out and then everyone point and laugh at the mirror. Doesn't usually work but when it does it's a story that never gets old.
<we now return to your regularly scheduled topic>
Theres an exhibit like that (sorta) at Ripleys museum in Delaware, and probably other locations.
When you enter, you pass the the two headed goat and all that shit, and you come to an exhibit that shows different kinds of people who can do recessive gene stuff with their tongues, curling their tongue into a loop, rolling it upside down, twisting it under like a flipped up doormat.
Theres a mirror where you can look at the different things some people can do with their tongue, and attempt to do it yourself, to see the results if you accomplished that oddity... but it's a two-way mirror.
So, you stand there making stupid faces in the mirror, and later on in the tour, you come across an exhibit of people doing retarded things and its the reverse side of the mirror, that idiot was you half an hour ago.
Its actually pretty funny.