Did a month of Krav Maga, the basics are easy to get into: stay balanced on your feet and kick hard. I don't practice much these days, too much going on.
I've done Brazilian Ju-jitsu off and on, I can remember about 3 holds off the top of my head. I have pretty good core strength, and I'm squirmy enough to get out of a hold, but I don't go on the offensive all that well.
I'd really like to try Aikido, but I'm on a bad schedule for any kind of classes.
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I'm a math evangelist, I believe in theorems and ignore the proofs.