G.O.B.: They’re pills that create a sort of temporary forgettingness. So if somebody finds out how you do a trick, you just give ’em one of these, and they forget the whole thing. It’s a mainstay of the magician’s toolkit, like how clowns always have a rag soaked in ether.
Tobias identified them as Flunitrazepam, or Rohypnol, tablets (also known as roofies), which cause temporary amnesia. Such tablets have been known to be used for a number of illegal and morally reprehensible actions such as date rape and robbery.
- Flunitrazepam on Wikipedia