When in the office bathroom, feel flatulence coming on, hold back on it and wait for someone to leave said bathroom. Once they open the door to leave, let 'er rip. Anyone within earshot of the bathroom doorwill think person exiting was somehow involved.
Mort: Hey Saul.
Saul: Yes Mort.
Mort: Boy did I do some office blasting yesterday.
Saul. Oye vey. Who'd you get?
Mort: Some schmuck from accounting.
Saul: Very good Mort.
Mort: Thanks. Smelt like a week old gefilte fish too.
Saul: Word!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"