5. Nuking The Fridge - Indiana Jones & The Kingdom of the Crystal Skull
One of the most infamous scenes in a major franchise movie, so prolifically awful is this scene from the fourth Indiana Jones movie that the offending act - in which Indy climbs inside a lead-lined fridge in order to withstand a nuclear blast - has supplanted the term "jumping the shark" as the new descriptor for movies that completely go past the line of credulity. Though the movie also deals with aliens, that I can just about deal with because the earlier Indy movies similarly toyed with the supernatural, but to try and have us believe that Indy could survive a nuclear blast is, well, just downright insulting. After all, he's not Superman. The close-up shot of the words "lead-lined" on the fridge really seals the deal; the suggestion is that because the fridge has a lead lining, it will protect Indy from the blast, which is patently ridiculous. In reality, the nuke would melt the fridge instantly, and Indy would be no more.