Yeah, I remember the days of working retail.
One thing I really hated was helping a customer and having another customer walk right up to interrupt with some incredibly stupid question that has nothing to do with the store I was working in.
One of my favorites was a person asking where to catch the taxi/bus/etc (I worked retail in a mall). My reply? "Outside". "Oh, cool, thanks!".
10 times out of 10 they never got the joke and walked away with a smile.
Edit: Sniff, Sniff...I've got a Sony laptop.