I had an amazing experience on my last test. I've been doing aikido for about two years and this past year I took two semesters of Japanese; I tested just before leaving Tucson for summer work in Chicago. Anyway, one of the test requirements is Saito's 31-count kata, with each move counted out loud, and sensei asked me to count. When I got to 22 I realized that (completely unconciously) I was counting in Japanese.
I was very surprised, since foreign-language number skills are the most difficult for me to pick up; but when my focus went to the kata the count came out appropriately. What I don't know is whether this means I've been studying Japanese too hard, or studying the kata not hard enough. Probably the latter.