For me it was American Warships with Mario Van Peebles (Captain and Carl Weathers.
View: https://youtu.be/Yr-Y8IeWymo
I didn’t think they made films this bad these days but this one is a turkey of truly gargantuan proportions. It’s not helped by Van Peebles who isn’t a great actor, in fact I’ve seen less wooden portrayals in Pinocchio. Carl Weathers is quite good but struggles with a terrible script. The plot revolves around a US fighter plane being attacked by North Korea, or so the military think but in fact aliens are responsible. The special effects are laughable and would disgrace a fifties sci fi movie.
Memorable quote; They’re not going to sink MY Battleship. Captain James Winston.
What’s the worst one for you?