Matt Damon resorted to "spanking" himself to make a sex scene in 'Suburbicon' look more believable.
The 47-year-old actor stars alongside Julianne Moore in the new George Clooney-directed satire, and Matt has revealed the unusual steps he took in order to make their sex scene appear more life-like.
He shared: "We had a good ping pong scene together. That was not dull at all.
"I actually bruised myself. Like, we realised the way the shot was, it looked like I was hitting her if I hit myself. And so I really let myself have it. I was spanking myself."
Matt - whose character kills mobsters to defend his family - revealed his on-set aggression prompted a quizzical reaction from his wife, Luciana Barroso, who was initially shocked by the red marks on his cheek.
Speaking to 'Entertainment Tonight, Matt joked: "I like it rough. I didn't realise how rough I like it. Then I got home and I was like, 'Wow.' I had one cheek that was completely discoloured. Thank God I wasn't hitting Julianne..."
Ultimately, though, Matt and his wife were able to laugh about the unusual incident.
The Hollywood star recalled: "She was laughing.
"When she saw my butt, my cheek, she was alarmed. And then I obviously looked and I'm like, 'Oh, God. Oh God. Oh, that's from - that was just from work, honey.'"
Meanwhile, George recently revealed he had "fun" torturing Matt while they were making 'Suburbicon'.
The 56-year-old star directed his old friend in the 50s race relations satire - which he co-wrote with Grant Heslov and the Coen Brothers - and he relished being able to put his pal into tricky situations during the shoot.
He shared: "It was fun to put Matt Damon on a little tiny tricycle."