Billy On the Street is a show that involves comedian Billy Eichner and a celebrity guest running around the streets of New York City and shouting at people. Sometimes they give people dollars for answering questions correctly.
In the latest clip, Will Ferrell, star of Elf, joins Eichner to yell at people about Christmas and test their knowledge of seasonal films. As you can tell by the way everyone is dressed, this was clearly taped during warmer months—so people simply don't have Christmas on the brain.
Some people are legitimately terrified by the shouting. One woman just completely dodges them, prompting Eichner to scoff, "What a little Christmas bitch."