The Simpsons Episode 10.06 D'oh-in' in the Wind

During a search for his roots, Homer meets Seth and Munchie, two aging hippies who lived on a rural commune with his mother. Inspired by their example and memories of his freewheeling mother, Homer becomes a flower child. After accidentally sabotaging their natural juice business, Homer tries to make it up to them by picking an entire crop of vegetables and making a whole new batch of juice himself. It turns out that Homer picked the wrong crop and has bottled a powerful blend of hallucinogens that drugs all of Springfield. When the police catch wind of what's going on, they raid Seth and Munchie's farm and Homer gets shot during the melee. Luckily, his only injury is a flower embedded in his head.