It is annoying but I no longer perceive these situations as embarrassing. Why should you? Just take your time saying what you need to say and don't worry about it. If someone stares at you, just smile back with confidence and carry on. That person just learned something thanks to you. When I want a tiramisu, I will order it even if the titititi... would take me half hour! :-) I almost go into these situations like "I am going to stutter now and y'all can kiss my..." It helps!