He names Justin Bieber as one of his influences.
Turns out, Beetlejuice is aBelieber.
When Keaton asked Beetlejuice to name his influences, Beetlejuice had a quick answer.

Michael Keaton and Beetlejuice have a conversation.Warner Bros. Pictures/Youtube
“Well, Napoleon was a pal,” he said.
“Bieber, of course, for obvious reasons.”
Beetlejuice added that, “Caligula was a wild man.”
Ryder toldEntertainment Weeklyinan interview published Mondaythat she hadn’t predicted that future for the character.
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“I never thought about Lydia ever being a mom.
“She answered a ton of those questions, and it felt so right.”
Beetlejuice Beetlejuicelands in theaters Sept. 6.