Mr. Pinchy was a lobster that appered in Lisa Gets An A. He was Homer's pet. Homer found him at a grocery store and decided to take him home to fatten up to eat. But gradually he grew emotionally attached to the lobster and decided to keep him as a pet, even naming him "Mr. Pinchy". He kept him in the fish tank, then an indoor wading pool. Marge wanted Homer to get rid of him by cooking him up, but Homer kept seeing Pinchy as a helpless "little guy" whereas through Marge's eyes, Pinchy looked like a normal vicious lobster.
At the end of the episode Homer told Marge that he placed Pinchy in a hot bath after he got dirty from chasing birds. Bart then commented on the smell of something cooking that entered the room. Homer then put one and one together and realized that it's coming from the bath. The episode then concludes with Homer distraught at the dinner table, sobbing while eating Pinchy, who had been unfortunately boiled alive in the tub.
