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1.
State that some given information is incorrect.

The person who had bullshit called on them may call it back if they can prove they are correct.
Person #1: The first president of the U.S.A. was Thomas Jefferson.

Person #2: I'm gonna have to call bullshit on that.

Person #1: What?

Person #2: The first president was George Washington.
by Eye Sac May 05, 2006