I'm a bit odd about facial expressions: while I have difficulty consistently producing expected expressions, I have always been pretty good at understanding the emotions that typical facial expressions are supposed to represent. however, on tests, they thought I was not good at this, because while I can connect an emotion to a face, and know a lot of words relating to emotions, I usually find it difficult to find teh word for a particular emotion I'm thinking of, and will tend to say "I don't know" or some random word that may be related to emotions, because I can't find the right one.

That came about mainly because from early on I learned that people react negatively when you have a big long gap between question and response, and also when you answer by repeating the question echolalically, so I learned to cope with auditory and speech difficulties by giving answers that are probably false rather than annoy other people.