I dont like it when I'm at a restaurant and my waitress has a limp. It makes me feel horrible every time I ask her to get me something. I feel like I should help her or something and help her get off her feet. That is the exact opposite reaction that you want when it is someone else's job to serve you food.
Also, the fact that she has a limp makes her spill my coffee sometimes when it's coming to the table.... and then I feel like a jerk for beating her.