Just to add my personal memories to his passing, I probably watched Gremlins 2: The New Batch 15 times when I was a kid, and I always liked him as the overly serious mad scientist, who had a laboratory in a giant skyscraper for some reason:
"I can get you diseases..."
Anyway, here's a long compilation of his movie deaths:
And a track from his Christmas metal album:
The guy was multi-talented. And 93 is a pretty great age to make it to.