Lol... man, in prison, watching others "twank out" was a form of entertainment all its own. In the process, of course, don't be a total dick, if someone's in danger or at risk of being caught, help, but holy shit could that shit be funny. I've seen individuals twank as uniquely as their thumbprint. Some seize, some puke - not funny, help you dick - but some laugh, some openly masturbate and some jump on the police. Fun times.
I may have er... lost my composure a time or two lol. Nothing too crazy.

Actually, I'm not necessarily defending them, terrible class of drugs overall, but I can't call them totally useless just because of the prison niche they fill, however badly. Introduction and detection, both of product and in urine, are THE two big issues with substances in institutions that "k2" addressed as perfectly as possible just about.
I vote 25-i.