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In the BBC Three documentary Tom Felton Meets the Superfans, which aired earlier this year, the Harry Potter star dressed up as the Joker and wandered around Birmingham Comic Con incognito.
Bryan Cranston also dressed up in a creepy-looking Walter White mask at San Diego Comic Con in 2013 (which Aaron Paul kissed during a Q&A).
Taking a leaf out of their books at New York Comic Con this weekend was Jared Leto and Mark Ruffalo, who were unrecognisable in their disguises.
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Leto, wearing some sort of weird mandrill mask, even met someone in Suicide Squad Joker cosplay.
Ruffalo somehow managed to look even weirder, though he didn't find a Hulk to pose with.
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