An ongoing guide to the things a fan should and shouldn't say during encounters with movie stars at the Toronto International Film Festival. We begin with Bruce Willis, star of the opening night movie Looper.

WHAT TO SAY

"Odd-couple detective stories just haven't been the same since Moonlighting went off the air."

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"Yippee-ki-yay, mother . . ."

WHAT NOT TO SAY

"I loved you in Look Who's Talking."

"Your son Ashton really takes after you. Except for the hair."

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Up next: Ryan Gosling