Step #1 - Pour yourself a glass of milk.
Step #2 - Fart into said glass.
Step #3 - Make your way to a room containing Person A who is an unsuspecting sibling, parent, girlfriend, boyfriend, or guardian.
Step #4 - Bring glass up to mouth as if to take a sip, make face, then offer the glass to Person A and ask Ew, is this milk off?
Hilarious, no? Even more so because of the unnecessary elaborateness [insert real word if you can think of it] of the plan. Or at least I thought so when a friend of mine explained that her little sister used to pull this on her. BTW, is this new material or did she steal it off an 80s teen movie?
Anyway, there's actually a Step #5 which is - make certain that you do not perform Step #2 in front of Person A, and definitely not in front of a dozen or so people in a party situation. It makes subsequent party conversation awkward and you may feel the need to leave soon after. It's highly likely that the next day you will experience headache, nausea and regret.