You can always test how sensible a person is by waving willy around at them. If their expression doesn't change and they just look at you with a bored expression, you know they're normal, sensible people. On the other hand, if they start squealing and make a bunch of weird remarks, you can be sure they're nutcases. Nudists are probably as sensible as you can get. All those nutcases who run around in suits and ties -- they're fucking crazy.