Today, we have Ralph Fiennes, moving further back in Brit Lit from Harry Potter, here to promote Charles' Dickens's Great Expectations, which has its TIFF premiere on Tuesday. If you spot him, try to keep the wizardry to a minimum.

WHAT TO SAY:

"Hope you're not also He Who Must Not Sign His Name, because I'd love for you to sign this!"

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"Riddikulus!"

WHAT NOT TO SAY:

"Finally, an adaptation of my favourite Dickens novel."

"What's Daniel Radcliffe really like?"