Charlie Todd causes bizarre, hilarious, and unexpected public scenes: Seventy synchronized dancers in storefront windows, “ghostbusters” running through the New York Public Library, and the annual no-pants subway ride. At TEDxBloomington he shows how his group, Improv Everywhere, uses these scenes to bring people together.

A motorcyclist who was pinned under a burning car after a collision says he’s grateful for the help of strangers who lifted the vehicle to rescue him.