I meant what I said in IRC: You'd have a better chance of tricking people if you ground it into powder first.
You could then tell them it's "shake" and apologize for having sold all the buds already.
You'll want to put it in small bags to make this illusion complete.
I've never done this, but I've seen it done many times.
Protip: Don't try this with large or particularly vengeful people.
Failure to heed this suggestion does NOT have a nice outcome.