Billy on the Street host Billy Eichner made his debut appearance on The Late Show, and David Letterman loved every minute of it. Following a round of “Celebrity Child or Kentucky Derby Winner"— a game that gets extended past the 30-second mark because Letterman wants to keep going — the two play a quick round of another popular Billy on the Street game, "Dead or Boring.” Letterman loves both quizzes, especially the parts where Eichner screams at him, which make Letterman giggle a lot. In turn, Letterman’s giggles only make Eichner yell more — all part of a vicious cycle.

Watch below:

After the games, Eichner shares a nice story about working with Joan Rivers and the kindness she showed him when he was at the start of his comedy career.