Just after Michael asks Buster where his hook is, Buster mentions he got it stuck in the stairs truck. We then see a flashback of Buster dancing around to Styx's "Mr. Roboto" in the stairs truck just before he gets his hook stuck in the dashboard.

Buster is played by Tony Hale who also appeared in a famous Volkswagen commercial. He was in a Golf dancing to a certain song. You guessed it, it was "Mr. Roboto".