Keith Richards - in a rather loose interpretation of "it's what he would have wanted" - apparently snorted his Dad's remains:
"The strangest thing I've tried to snort? My father. I snorted my father. He was cremated and I couldn't resist grinding him up with a little bit of blow."
It's not, strictly speaking, dishonouring your mother and father; nor is it quite cannibalism. But just as there are some lines you should never cross, there are also some lines you should never do - and "your Dad" is surely one of those lines.
We really would advise Keith's kids not to do their same when their pappy goes - his ashes are going to be so pure, they'd make Pete Doherty wince.