The comedy group Improv Everywhere had 20 women go to Katz's Deli in New York, where Meg Ryan's famous fake orgasmscene from "When Harry Met Sally" was filmed.
And they ALL reenacted it at the SAME TIME. The video is on YouTube, and they kept it up for a full MINUTE.
(Search for "When Harry Met Sally in Real Life." The first woman starts at :30, and the rest join in at :55.)