I'm 210 lb, and 6'2" or so, nothing in contrast to any of the people in high physical percentiles. (Or my brother, who is 6'5" 180 lb or so, is double jointed with long fingers and looks malnourished) So that's not too weird. I can, however, bend double forward far enough to put both feet behind my head (as a kid, I bit my fingernails AND toenails. Glee!)
I have one infini-crack joint as mentioned by others, and my favorite physical abnormality is the fold in the upper corner of each ear which makes it seem slightly pointed. I also have stress related tics in my eyelid from time to time, and a very high pain tolerence and endurance. As to things non-physical, I'm obsessive while having a short attention span (figure THAT out), an Anglophile from The Kinks all the way to Keeping up Appearances, and fond of psychedelic rock (Syd Barret Pink Floyd, Chocolate Watchband, Jefferson Airplane, The Byrds, Strawberry Alarm Clock, The Electric Prunes, The Nazz, and so on.) H.P. Lovecraft is enough to cause most people I know to raise an eyebrow when referenced, so naturally it's on my list of Bizarre Things That Are Really Rather Neat like werewolves, classic myth, webcomics...
My study habits are atrocious, mainly due to anxiety problems and subsequent procrastination, so in some respects, sucks to be me. However, at 22 I'm probably one of the youngest experts on Series Land Rovers in the US and have built one (yay!) due to being a more-or-less competent mechanic. I'd delve into detail on other interests and humor, but suffice to say like most here I'm likely the weirdest person they know (in person). Minimal Spanish vocabulary, and 4 semesters of college Germanround out the picture
High visual and reading comprehension skills mixed with poor socials skills, inability to recall names, empathize, probably hint at some type of high-functioning Asperger's, what with some family background there. Usual geek skillset; computers, games, circuit analysis, machine building (not stereotype as much), encyclopedic memory on trivia... This combined with a light complexion and resulting tendency to burn leaves me open to legions of geek jokes, but few ever come, oddly. I have a long list of other odd things, but most of them are circumstance related and not about me per se, like the 5 months I spent in South Korea near lepers.
EDIT: Oh yes, I too have a phone-phobia. And I likes me some guns and guitars, despite being quiet and asexual in tendencies enough some people are likely sure I'm gay.