I always feel a bit sorry for the server when our group goes out to dinner. Collectively, we have 3 allergies (tomato, seafood, chocolate) and two restricted diets (gluten-free and kosher*.) Chocolate is the easiest one to avoid, but you would not believe how many things have tomato in them. Anything red is automatically suspect.

*won't eat pork or meat/dairy in combination. If she had to eat strict kosher in this town, she'd starve.