When he was a lad, he was the victim of such parental abuse by his adoptive monkey parents, he decided to leave Toon Town for over 9000 years to team up with Doctor Robotnik to help catch Sonic and Tails. He then took a few driving lessons with Dan Backslide in a stolen runabout in where he committed 3rd degree manslaughter against seven different pedestrians, until he was stopped by the Dover Lover Boys, where he lept into a pool of Luigi's Spaghetti to escape.
After some time, he took Robotnik's time machine to Paris, where he partook in the Festival of Fools. He ran off with over five million US dollars in useless crap into the time machine, where he sold it all for crack.
Death and Resurrection
Goofy died during the events of Kingdom Hearts II by getting hit on the head with a rock while protecting Mickey Mouse. He was resurrected by the Pingas and retains no memories of his former life.