The absolute dumbest prescription I have ever seen:
Sent via facsimile, mind you...

Norvasc 5mg #90 1 po qd refill x3

I'll leave off all the patient specific stuff for HIPAA purposes, but everything on this Rx was perfect...up until the very last line...

***CANCEL THIS PRESCRIPTION***

Why the hell did you fax it to us then???

Waitress, I would very much like a cool, refreshing glass of ice water....did I just order ice water?  Please cancel that.  I don't want water at all.  I want the complete opposite of water.  What do you have that's least like water?