Elevator surprise 

When you fart in the elevator and leaving it then someone calls the elevator up along with your farts rendering them surprised by your intense gases.

You can be either the giver or a recipient of an elevator surprise.

I left an elevator surprise so bad that when I called the elevator back I can still smell my own farts.

I was the victim of an elevator surprise. It smelled like egg flavored strudel.

Elevator surprise by zaqwerty1 April 30, 2014

An Elevator Suprise 

When you fart in an elevator before you exit, leaving it for the next unsuspecting person.

Jaime left An Elevator Suprise for his boss Jim, when he was heading down to the break room.

An Elevator Suprise by UrbanCreatornoob May 13, 2017