First, it's 'you're'. Second, what one person calls being paranoid, another calls being well-informed.

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Zack: *sticks out fist to bump*
Brennan: *stares*
Zack: You're... supposed to bump my first with yours.
Brennan: Why?
Zack: *shrugs* I'm told it's a widely acknowledged gesture of mutual success.
Angela: I love it when you two impersonate earthlings.
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Booth: Are you trying to black mail a federal agent?
Brennan: Yes.
Booth: I don't like it.
Brennan: I'm fairly certain you're not supposed to.