Baywatch
Utterly, irredeemably awful. I saw the trailer and thought it might just be knowing enough to get away with it. It wasn't, and all the swimsuits full of Alexandra Daddario in the World couldn't have saved it. I swear to God, you'd be better off watching the original, and I detested the original. Absolute fucking shit.
Caveat: the last half an hour might be brilliant. I wouldn't know, I couldn't watch any more and switched it off.
CHIPS
Talking of reboots that need to be knowing... CHIPS is a buddy-cop, Odd-Couple, dick-joke movie that's really stupid and really quite charming. Dax Shepard and Michael Peña are hugely likeable (indeed, Peña's made a career out of it) and are clearly having fun with their roles. If you're stuck on a flight with nothing better to watch, you could do much worse.