The series of events here show just how shocked Mark Ruffalo was to see Paul Rudd at Comic-Con. He totally freaked out. As would us too. Here it is:

1. Mark spots someone famous.

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2. Realizes it could be Paul Rudd.

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3. Questions himself over and over again.

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4. Checks to confirm.

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5. Still in disbelief.

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6. Confirmed identity.

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Here's the whole interview: