Robert Kamau/GC Images; George Pimentel/Wireimage
Michael Miller
October 12, 2015 05:50 PM

You never know who might be hiding behind the masks at Comic-Con.

Mark Ruffalo and Jared Leto went incognito at the event in New York City this past weekend, donning some crazy masks and mingling with their unsuspecting fans.

Disguised in a giant baboon mask, Leto snapped pictures with a fan dressed as his Joker character from Suicide Squad.

“He had no idea. :),” the actor, 43, captioned.

The Incredible Hulk was also strolling around unnoticed around the convention, disguised as a cigar-smoking, mustached old man.

Got to hide out and enjoy #comiccon2015

A post shared by Mark Ruffalo (@markruffalo) on

“Got to hide out and enjoy #comiccon2015,” the Avengers actor, 47, tweeted.

Ruffalo and Leto aren’t the first celebrities to take advantage of identity-concealing costumes at Comic Con. Last year, Daniel Radcliffe had a blast going to the event undercover as Spider-Man.

“It’s great to be able to put on a mask and interact with people who don’t know who I really am,” he told Entertainment Weekly. “I spoke in an American accent the whole time. I felt like a spy about to be found out at any moment.”

Andrew Garfield, The Amazing Spider-Man himself, also went disguised in his movie costume at Comic-Con 2013, and Game of ThronesMaisie Williams went as an anonymous webslinger last year.

Have you seen this girl? #SDCC

A post shared by Maisie Williams (@maisie_williams) on

Peter Jackson and Jack Black have also copped to attending the event in secret, as an evil jester and a Stormtrooper, respectively.

VIDEO: Now You Can Dress like Jared Leto, Thanks to Jared Leto!

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