Migraine Time

You can tell when I'm in a migraine phase by some of the things I say, or don't say. When I'm in the phase I sometimes stutter, have problems finding the exact word, or say something not quite right. Tonight at In'N'Out I looked at the menu and and asked for a number four. Their combos only go to three - I read the dollar amount as the combo number. The clerk started to look for it on the register, then realized thst there are only 3 combos. I'm getting over a migraine - what was her excuse?