Scientists sometimes do crazy things. Too crazy. Purple Slinky blog (what a name) has an intriguing post about 5 scientists that went too far in the name of science. Take, for instance, Vladimir Demikhov:
Demikhov was a pioneer in organ transplantation. Although he was unable to be the first to do heart transplants in humans, he did do many organ transplants in animals. He was most notoriously known for creating a cruel monstrosity in 1954. He surgically attached the head, shoulders, and front legs of a puppy onto a mature dog. People were astonished, if not repulsed, to see the animals lap up milk from bowls.
Link (with video clips) - thanks Jon Jason!