Bartels can go in depth about the Buttercup, seeing that he nearly got 'cupped into the double digits on the way home from Topeka on Saturday. But more importantly, to Buttercup correctly use this technique:
1: Rip one

2: Wait three seconds

3: Reach south and cup it

4: Move in on the unsuspecting victim (and most importantly get it over the mouth and nose, or else it's easily blocked)

Also, possible set ups:
The "Garret Evans"- while someone is sleeping pinch their nose and then hit them with the cup.

The CradleCup- Get someone in a good cradle and there it is.

The "ABartels"- Punish the one armed man for calling shotgun, and let him smell the fury of Golden Corral for an hour and a half.