That was probably a really poor April Fool's joke some idiot made up. Shame on that person. If you're one of those weirdos who accepts drinks from random guys, I guess it doesn't hurt to be cautious.
And for the record, if you're a dude and you've ever contemplated using Roofies, die. And if you don't want to die, there are plenty of people I know who would like to beat the shit out of you. Dickhead.