LOL - to be fair, I knew a couple of fairly bright folks that got on the ..
CRACK ROCK for an extended period. Probably originally B brains - took 'em down to a C level, at least. If I had to guess, it probably knocks 15 -25 pts off the IQ for most that stay on it awhile. Sad thing is that those that I mention at least had a little extra to lose. Most that get on the ROCK never have a whole lot of brains in the first place. Really takes 'em down a peg.