"Oh my god, they're not going to do predictable thing __X__ are they? Bwahaha"
"Hahahaha, this dialog is completely unbelievable"
"Welp, that unwinds all the interesting things happening in that character's arc."
A couple things that laughter can't even redeem:
- Incessant deus ex machina. The prose can be good, the dialog believable, the world interesting, and the characters likable... but if all the problems just get waved away in some random unpredictable way, that's infuriating.
- Even worse: when a POV character has an ace up their sleeve the entire time that could have been played at any point to avoid all the conflict, and the only reason why we're in suspense is that POV character didn't share that with us.