Simon Pegg stole a Starfleet badge from the Star Trek Into Darkness set.
The actor - who plays Enterprise engineer Montgomery 'Scotty' Scott in the space saga - couldn't resist keeping a memento from his work on the film, despite tight security surrounding the pricey props, and stole the badge his character wears on his uniform.
Speaking to BANG Showbiz at the Star Trek Into Darkness press conference at City Hall in London, he said: "On the first film, every day we'd hand back our badge and I had a Starfleet ring, communicator, phaser ... You'd hand it in ... at the end of the day before you could leave the set.
"This one, I stole my badge. It was on my costume when I got back to my trailer and it's a beautiful little brass thing. And I put it in my bag."
Turning to the film's director, J.J. Abrams, the actor joked after admitting his secret: "Yeah! What are you gonna do?"