I love the Pumpkins, I really do, but I ruined them for myself.
I was playing Disarm on my acoustic one day for some friends at a party, and all of a sudden, I thought, I'll sing this like Cartman from South Park, and throw in some Cartman lines, and... well... there wasn't much of a stretch there. Corgan really, REALLY sounds like Cartman.
He's a great songwriter, though, but now I can't ever hear them without thinking about South Park.