TS, yes really. To disobey the lawful commands of my crew, which includes the seatbelt sign, is illegal. You might get one chance, depending on how good a mood I'm in, but that's it.
in fact you don't have to be arrested just being escorted off by the cops is usually enough to scare the crap out of someone and the couple of hundred odd other observers see what happens when you dick about.
Resolving these situations is your job using the captains authority. If you don't want to do it I'll get somebody who will.