And you thought it was weird that Ke$ha brushes her teeth with Jack Daniels. Ke$ha says her new song "Supernatural" is about her "erotic experiences" ... with a ghost.

"It's about experiences with the supernatural... but in a sexy way," she told Ryan Seacrest on his KIIS FM radio show. "I had a couple of experiences with the supernatural. I don't know his name! He was a ghost! I'm very open to it."

SODAHEAD SLIDESHOW: See the most 'out there' celebrities.

Um, ghost sex? And we thought her "suck it" lip tattoo was bad!

But Ke$ha looks at being quirky as a part-time job. She also told Seacrest that she just got back from Africa, where she was "rehabilitating baby lions" as part of a "crazy spirit quest," on which she was also hypnotized.

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From Ke$ha to Tom Cruise to Nicolas Cage, let us know: Who is the most "out there" celebrity?