From the first time we saw the trailer for 'Friends With Benefits,' we immediately thought, "What the hell? They just made that freaking movie." Still not seeing it? Check out the tagline for 'No Strings Attached.'

Granted, the verdict's still out as to whether or not 'FWB' manages to bring something different to the table from 'NSA,' but while the whole "Let's just sleep together without getting emotionally involved" shtick doesn't exactly break new ground for rom-coms, it's never been so clearly at the forefront like it is with these two.

Which got us thinking: This isn't the first time we've come across two suspiciously similar movies that got released so close together that comparisons were inevitable. From WWII to reality TV, Hollywood has never been a stranger to piggybacking off a successful formula. With the help of our buddies over at Rotten Tomatoes and their handy-dandy Tomatometer, we figured we'd take a look back at the ones that worked and the ones that probably should have stayed on the cutting-room floor.

Check the full list of carbon copies we came up with: