Playing Offenbach's Cancan at full blast and thereby allowing people to hear it, basically works like a rickroll
Person 1: Gotta go and do some cancaning
a few moments later Person 2: AAAAHHHHH! I have been cancaned for the 19821396862nd time!
Person 1: lol, get trolled
Bitch: OH GOD YES,CRAM THAT CAN!!!! UHHN UHHN UHHHNNNNN.
Dude: I am glad we cram canned this girl.
Dude 2: I am currently cram canning, Dude. Please don't look me in the eyes.
To make an abusive comment about someone while in their presence followed by immediately uttering "What??" with an upward inflection to trivialize and obscure saidabuse.