Although the idea of having to work alongside one of our former significant others every day of the week makes us cringe, The Big Bang Theory costars Kaley Cuoco and Johnny Galecki might be the world's friendliest pair of exes. Since splitting after two years of dating in 2009, the two have had some fun, platonic appearances out together, but Cuoco's recent behind-the-scenes shot of them on set takes their relationship to a whole new level. "#bts of last nights @thebigbangtheory__ #kaleyspolaroids #corsettook15minstogeton @sanctionedjohnnygalecki," she captioned the Fifty Shades of Grey-esque Instagram, which features her and Galecki rocking leather, chains, fishnets, and not much else. The scene went down in a recent episode, when Sheldon (Jim Parsons) has a nightmare that their characters, Penny and Leonard, have turned his room into a sex dungeon. It's definitely not as romantic as Penny and Leonard's adorable wedding in the season 10 premiere, but it sure is memorable.