According to a quote given to NME (who probably doesn't get to use the question, "What's the weirdest thing you've ever tried to snort?" all that often), Rolling Stones guitarist Keith Richards once snorted the cremated ashes of his father Bert, who died in 2002. Quoth the raven, "He was cremated and I couldn't resist grinding him up with a little bit of blow. My dad wouldn't have cared."
The street value of Richards' father is estimated at $180/gram.
UPDATE: And here comes the publicist denial.