Really fucking annoying is when you tell them (immigrants who don't speak english in general) that they CAN have what they are saying they want, and they start getting pissed off at you because they think you're saying no. You have to pretty much cut them off, talk over them, or just plain make them shut up somehow so you can explain that you are saying YES to them.
Had one messed up call tonight. Immigrant, poor english, and blind. Felt bad for the guy, cause he seemed nice, but fuck, is that a frustrating combo.