Consuming cremated ashes: sighted in movie

The 1981 film "Honkytonk Freeway" has a brief scene in which Daniel Stern's hitchhiker character inhales a powdery substance from a big urn. Beverly D'Angelo's character informs him that it is her mother's cremated remains. He then coughs and spits.

The scene reminded me of http://www.snopes.com/horrors/cannibal/cocaine.asp