Crack or meth. Especially meth--they can't be still. I saw a really disturbing clip of a woman in custody at a police station (it was a reality TV show) who was handcuffed and chained to the bench she was on and she was just writhing around, over and over. I think if she could've gotten just a little bit of lead on that chain she would've been doing contortions like a Hindu sadhu (an aesthetic who practices extreme forms of yoga etc). It was horrible to watch. I can't imagine being in such a state. How, oh how do people enjoy that? I hate it when I can't sleep because I drank some coffee too late in the day!!