I've been told I have Asperger's by someone who has it himself. Never been actually diagnosed by a doctor or anything.
I have an obsession with organizing things like how much I eat, how much money I spend, my weight/body fat, and whatever errands I have to run.
When I organized my papers for my tax return, I put them all in envelopes categorized by what type of expense they were (automobile expenses, donations, etc). The guy who did my taxes told me "You're nothing if not organized."
It's also helped me keep in shape. I have dozens of spreadsheets (probably even a few hundred at this point), detaling what I eat in a day (I often reuse sheets/daily diets, so I don't make a new one every day). I use the spreadsheets to make sure I have a good intake of fats, proteins, and overall calories.
Because of my obsession with my diet (and because I'm a cheap bastard), I'm hesitant to eat anything that isn't prepared/cooked by me, whether I'm at a restaurant, or a friend's/relative's house. I prefer the taste of my own food for the most part, and it's also healthier and more filling.
I'm fairly obsessed with work and keeping in shape. I almost never miss a day of work/school or mixed martial arts training, unless I'm either sick, injured, or have some other important event going on that takes place at the same time.
As a result of this, I hate vacations. There's nothing I'd rather do for fun than train, and going for a few weeks without stepping foot inside a martial arts club of some sort makes me feel like SHIT.
I also don't care much for going out to restaurants, clubs, movie theatres, or bars. So I pretty much have no life outside of work, training, video games, or the occasional community/volunteer event.