What can be said about you that can’t be said of anyone else (that you know of) on the SDMB?
For example, as far as I know, I’m the only one here currently living in Israel.
I’m the only Mississippi State University student, the only goth cowgirl, and the only one dating Gunslinger.
I’m the only one living in a different state than the one where everything I own is (except the clothes I wear to work.)
I’m also, I think, the only Doper to have driven a stock car (and IIRC, MikeG is the only one to hae driven an open wheel racer.)
Not sure, but I might be the only one with 1/3 of my eye color (wedge-shaped on the top) brown and the rest hazel/blue.
I’m the only one that’s a student at Oklahoma State, though there are alumni on the board.
Other than that, not a damn thing I can talk about that I can think of.
I’m pretty much the only one with my username.
It may not be much of a unique quality, but it’s mine, dammit.
I am the highest-posting newbie who lives in Canmore, and has red hair.
“You’re all individuals”
“We are all individuals”
“I’m not”
AFAIK, I’m the only professional or semi-professional stand-up comedian.
I’m willing to bet big money that I’m the only Doper, male or female, who has a blue pearlized 3/4 size Carelli 120 bass accordion.
I think I’m the only one driving a Suzuki Swift. I may be the only person who worked for a “Payday Loan” company, but I could be wrong. And I’m definately the only one who moved from Maine to Chattanooga to Murfreesboro to Nashville to Jackson, MS, to Atlanta over the course of 5 years. 
I’m the only…um no, someone else has done that too…
Oh wait! I’m the only Doper who can…no, I learned how to do that here on the boards…
Uh, I’ll get back to you.
I’m the only person on the boards who looks EXACTLY like me. Well, more or less.
AFAIK, I’m the only one here that is a beekeeper. And I must be the only one that goes to Wells College.
I’m the only actress that’s in her late 20’s, lives in Chicago, has big boobs, wears pigtails and doesn’t hang out with chicks much.
Oh, wait…
Damn you, jarbaby!
<sobs>
I’m not SPECIAL!
I guess it’s safe to say that I am the only one here that has had facial reconstruction due to being attacked by a dog. (Until, of course, comeone else comes forth.)
I am, of course, The Gay Guy[sup]TM[/sup].
Esprix
I think I’m the only wine consultant in here.
I think I’m the only one that wants to trade my rotten little dog in for a cat.
I’m pretty sure I’m the only one that has discovered 57 different ways to enjoy Ham.
No other woman in here but me has had sexual relations with Turbo Dog… Oh wait… that’s not true.
I think I’m the only one who got to drink all night with Ron Jeremy after a porn awards ceremony in Vegas.
I fairly certain that I’m the only one who was the stripper by profession who was hired for her fiance’s bachelor party… and yeah… I did him after the show:)
I think I’m the only one who did a toothpaste commercial with Dinah Shore. (?)
I am for sure the only trochilidologist on the boards.
I am probably the only member with a frozen cuckoo in my refrigerator.
I’m the only one that’s done unspeakable things to racinchikki in a bowling alley parking lot. 