10 Movie Villains Killed By Their Own Weapons

10. Joe "Mental" Mentalino - Dumb And Dumber (1994)

Taxi driver Lloyd Christmas becomes enamoured with one of his passengers, Mary Swanson, and when he sees her leave a suitcase unattended at the airport, he and his friend Harry travel all the way across America to return it to her. Unbeknownst to them, Mary left it there on purpose to pay off a ransom held against her wealthy family.

One of the ransomer's henchmen, Joe "Mental" Mentalino, poses as a hitchhiker to get close to Harry and Lloyd, thinking them to be hired professionals. When they stop at a diner, Mental plans to poison them by slipping arsenic into their food. Totally oblivious, the pair load Mental's burger with chilli peppers, which causes his ulcer to burst when he bites into it.

Writhing in agony on the floor, he tells them to reach into his jacket for his pills. And, not knowing the difference, Harry and Lloyd eagerly feed him the whole bottle of rat poison tablets.

It's the painful misunderstanding on both sides that makes this scene so interesting to watch. Mental's final look of hatred as he mistakes their actions for a deliberate tactic is truly priceless.