I swore off trailers after watching Star Wars: The Force Awakens in the theater. The scene where Han tries to convince Kylo Ren to turn away from the dark side was ruined for me because I knew there was a scene in the show where Rey and Kylo were having a duel.
Ever since then if there’s a movie I even slightly care about then I’ll completely avoid the trailer.
Another thing that pisses me off is when something is labeled a ‘teaser’ but it’s 1:30+ minutes long. That’s not a teaser, that’s a trailer.