New York's Katz's Deli is a pretty iconic and loud eatery in Manhattan, and so is the fake orgasm scene from 1989's "When Harry Met Sally."
The prank collective Improv Everywhere placed 20 women at different tables and the actresses let their inhibitions go. Don't worry, children weren't at the restaurant. The staff didn't know either, but in the end everyone had a good time. Cigarette, please.