Silent surprise

The act of when a small group of people are hanging out, and one person let’s out a silent but deadly fart without letting anyone else in the group know it was them.

David: *farts silently*

Mason: “What in fuck is that smell?”

Jason: “Seriously I can not breathe, what in the hell is it?”
Kyle: “Someone let out a silent surprise. Who the fuck was it?”
David: “Yeah, who was it?”