riddles, roofies, and ring leaders

The other night I went out to a bar with some friends to celebrate some one's birthday. A staple in our group of friends who could not attend that night sent me a text:
"You have one hour to solve this riddle. If you can't solve it, you need to go up to the creepiest guy in the bar, buy him a drink, and do a toast in my honor. Do you accept this challenge?"
Psh, of course I accepted, mother truckers.

The Riddle:
The person who makes it does not know the person who uses it. The person who sells it does not know the person who uses it. The person who buys it does not buy it for themselves. The user does not know that they are using it.
The Correct Answer? Coffin.
My Answer? Roofies.

He accepted my answer.

But...
After everyone left....

I went up to the guy who my friends deemed "creepiest dude in the bar." I bought him a drink. He bought me a drink. I gave him my phone number.

....whoops???

Audaces fortuna iuvat,
-Whit