For me, it was Peter Benchley's
'Jaws'. I read it long ago & it will always standout as the WORST ENDING EVER! It was so flippin' sudden, I had to go back & reread the last couple of pages to make sure I didn't, somehow, miss something! I was
really enjoying the story. Hooper's relationship with Brody's wife was an interesting read, as was the rest of the book. It's just that ending: When the shark is charging at Brody, who is just treading water. No boat. The crew is dead. It's coming at him full speed & then...
...it
JUST dies & sinks to the ocean floor. What a letdown.

"I can't live the buttoned down life like all of you! I want it all: the terrifying lows, the dizzying highs, the creamy middles! Sure, I might offend a few of the blue-noses with my cocky stride and musky odor - oh, I'll never be the darling of the so-called 'City Fathers' who cluck their tongues, stroke their beards, and talk about what's to be done with this Monkey_Boy?!"