Just because it's legal, doesn't mean it's safe
I guess some people actually NEED to be told this??
None of the following things is specifically ILLEGAL, at least not everywhere:
Feeding a 3yo four double-espressos before a cross-country flight
Driving one's car into the ocean, river, or lake
Jumping from one's own roof in order to test the tinfoil "flying suit" that you've constructed in your family room
sleeping in a chest freezer
drinking Drano
It seems to be a rare individual who doesn't comprehend that some things are just a bad idea, however.