I worked in a department store when I was a teenager. My favorite was when people came in looking for a video game console days after it released and ask you to look in the back because maybe one fell between some skids or something. Like Buddy, if we had one to sell we'd have sold it. Those things go right into a cage once their received. Ain't no one losing track of them, they literally print money for the store. A lot of people just assume retail workers are all incompetent.

Adding in edit: although sometimes it ended up with the customer screaming at us, it was always great to ask them if they really thought they were the first person today to come up with that idea. For a moment before they yell again they look dumbfounded. Worth it!