I'm really certain in this case it was just going too far - I was already slurring-my-words drunk when I took that shot, my inhibitions were generally not lowered (while I did insult the hair of the guy who let me crash immediately upon arrival, I also adamantly and repeatedly confirmed that there would be no bootay-having), and I had almost no hangover.
Roofies definitely happen. I try to be cautious about my drinks. As far as I'm aware I've never been drugged... The only other time in my life i've blacked out was definitely due to me not knowing my limits and overindulging. But I have friends who believe they've been roofied. I don't go to that bar.