how about this one... The Good Guy Always Wins, I dunno why, but that one has always bugged me. I mean c'mon, how many times can a hero wake from a coma and within twenty minutes of waking up kill all the bad guys and get the girl.
Heres my ending,
The good guy gets shot in the head yet somehow survives. he lies in a hospital bed recovering when a female nurse comes in to change his bandages. she goes about changing his bandages as usual. as she gets the last bandage off she shows him a picture of his love intrests dead body. he tries to struggle and realizes hes been restrained to the bed. The nurse walks over to the heart monitors and shuts them off, the walks back to her tray of bandages. pulls piano wire from her tray and proceesd to strangle the hero. The hero is now dead. The nurse places bandages over the piano wire marks and camly walks out of the room.
Meanwhile,
The villain walks out of his office and is given a package. The return address is his own headquarters, and the receiving address is his warehouse. he drops the box which glass vials inside break releasing chemicals that when combined explode. The villain pulls one of his guards on top of himself as the bomb goes off. After the explosion is over the villain crawls from under his guard and stands. Miraculously he is unharmed. As he stands in astonishment his, thought to be dead guard/shield, fires his revolver and with a single shot kills his boss, then dies a painful death from the horrendous burns he has received.
There, thats more like it. Everyones dead, no one wins, good movie, game over, No one saw the ending coming. Thats my kinda ending.