Sarah Silverman is a great comedian. Not only is she funny but she’s always treading a fine line between being family-friendly and filthily-rude.

This video shows her segment on Conan recently, in which she demonstrates this fine line with aplomb.

Silverman’s smartphone trick is to take a photo of someone’s mouth with their tongue poking slightly out, and then to place the phone (which is displaying the image) over her crotch.

It’s pretty genius, because you’re not actually seeing anything rude. It’s just your mind perceiving what you’re seeing as being rude. Not only that but it’s a trick anyone with a smartphone can do. Do it, do it now!