I have two...
+ Drawing. I can't draw to save my life. I don't understand perspective at all, I seriously cannot draw. I can - sometimes - draw your simple, smiley-face picture, but that's about the extent of my drawing skills.
+ Singing. I can play several musical instruments, but I sing atrociously. I can sing along when I'm playing, but my singing is badly off-key
I've had music lessons and I sat through numerous music exams where one of the requirements was to sing notes out loud. Apparently they didn't work 
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Said the apple to the orange,
"Oh, I wanted you to come
Close to me and
Kiss me to the core."
Think you're ASD? Get thee to a professional!