Plants: "Hey Evolution, can I get some capsaicin to deter mammals from eating my seeds? I want birds to spread them instead."
Evolution: "Sure, here's some DNA to make your fruits spicy for mammals."
Humans, the supposedly intelligent mammals: *deliberately breeding increasingly spicy peppers and creating entire hot sauce industries while sweating profusely* "This pain is delicious."
The ultimate evolutionary backfire. Turns out the best way to ensure your species thrives isn't to deter predators but to convince them you'd make a fantastic condiment.