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Bill Hader was never in the running for Employee of the Month.

Long before he became one of the standout stars on Saturday Night Live, the 33-year-old comic made money working at a movie theater -- until he was abruptly fired, that is.

Why did Hader get a pink slip? "A sorority group rented out the movie theater. They were rude to me so I told them the end of Titanic," he told Us Weekly at The Adventures of Tintin premiere in NYC December 11.

"I said, 'The boat sinks, Leo dies, the old lady -- that's Kate Winslet -- she has a jewel and she throws in the water at the end, so that's where that goes!'"

It wasn't until later that Hader realized the ramifications of his retaliation. "In my head it was worth it, but then I got home and I was like, 'Oh sh-t!"

Tell Us: Did Bill Hader deserve to be fired for spoiling the movie?