Not a fear per se but I abhor using a telephone.  Also, ordering at a drive thru I get so panicky trying to be fast and not take up too much time that if I have a hard time saying what it is I want, I’ll end up ordering something else instead just so I can end the interaction.  Soooo many times I’ve driven away with food I really didn’t want just because I couldn’t get out the words for what I really wanted.