When I first started working in a paint department, I had a lot to learn as it is was an area with a lot of different paints, stains, applicators, solvents, methods etc to it. So the first few months, you try to help people as best as you can. One guy came in asking for "thick paint" which is still one of the dumbest things I've ever heard for someone to want. A paint's thickness does not guarantee coverage or durability, some of the better paints I've known were sort of thin and rolled really smooth.
I didn't know much at the time as a newbie, but I figured he wanted "thick paint" for a reason and I had guessed that maybe he wanted a porch paint. I tried to ask him what he was wanting it for and he yells "Can you get me someone who knows what they're talking about?" and this was the point where I wanted to tell the guy to go somewhere else and some other un-polite things. But you can't really do that in retail, so a co-worker named Joey who helped on weekends gave him some paint and he walked off happy. I recalled exactly what Joey gave him months later and it wasn't even a "thick" paint as I had rolled it myself.