I worked in a hardware store, and once had a coworker call asking for a left-handed screwdriver. Not wanting to be rude just in case their was such a thing, I asked my supervisor, who picked up the phone and said, "Hello, Scott." Who promptly hung up on her.
It was much more amusing when this really spazzy kid started working there and he followed (the same) Scott around for about a week. Scott finally sent him off to look for a left-handed, metric crescent wrench, confident that the search should keep him busy for a while. All crescent wrenches are the same (metric v. standard, right v. left) but we had a whole section of wrenches for the poor kid to search. The kid caught on pretty quick - only took about an hour or so.