Mindbender
As some cars drive along a road, it starts to rain. They turn into a driveway and approach the gates and then proceed into the grounds beyond.
People get out from the cars and put up umbrellas or turn up their coat collars. But seven men who are proceeding along the gravel pathway don't try to protect themselves from the rain.
Six of them just start walking a little faster as the rain pelts down. But the seventh man takes no notice.
Strangely, it is the seventh man who doesn't get wet at all while the others get soaked. Can you work out why?