OK, I admit I got the idea from http://boards.straightdope.com/sdmb/showthread.php?s=&threadid=119142 . Go show them appreciation and visit that thread after you’ve visited this one. 
SweetZombieJesus gave me a good chuckle.
Sue Duhnym. Probably the best anon handle I’ve seen anywhere.
Two posters who I don’t see around any more and didn’t hang around too long had names that made me chuckle.
Don’t Poke the Bear, Dad! and That Guy with Pants.
Since my thread is near the top, now is the time for me to respond to my own OP without being accused of thread-bumping.
(your name here) is very witty.
For some reason, FireUnderpantsBoobs sticks out in my mind, even though I have no idea what that name is supposed to mean.
Hmmm… how embarrassing. I always pronounced it (inside my head of course, reading the board out loud while you reviewed and posted might be evidence of some mental aberration or behavioral disorder… but I digress) “Sue done 'em=him” which has a different context entirely.
[Cibo Matto] “You must be slow on the uptake”[/Cibo Matto]
typo mna is quite witty. I just can’t figure out how to pronounce it. Should I say “typo man,” as that’s obviously what it means, or “typo muh-nuh,” as that’s what it looks like?
I think too much. I think. 
-Loopus
LaToyota Corolla Falana is subtly hilarious.
I am, of course, partial to my own name (check the sig). However, AskNott is very cool, as is Yeah.
You’re not the only one, Astro. Bangs head on keyboard I can’t believe that I completely missed that one. I do have a tiny bit of an excuse, however. It’s close enough to my real, commonly mispronounced, last name, that I always thought it was kind of cool, since it forced the reader to pronounce it correctly(or so I thought).
Bangs head on keyboard some more
~V
vivalostwages is a quality handle
I’ve always been a fan of Tequila Mockingbird. And Don’t Poke the Bear, Dad! was hilarious. I still get a chuckle when I’m looking through the archives and see that username.
Biggirl, That Guy With Pants is still about and posting, although I believe he was away from the boards for a while.
I’ve always been partial to SmackFu. I has a certain, oh, I don’t know what…
You’re not alone. When I met Sue at a DopeFest a year or so ago, I told her the same thing–and felt equally slow on teh uptake. But, you’ll (we’ll) be relieved to know her reaction was more or less “Yeah, yeah…” Apparently, it’s a fairly common misread.
Iamthecowgodmoo
EnderW23 was pretty inventive. Everything after that has been a washed up imitation of the original, IMO.
Big K B , you make me blush.
“Mmmm! That is a tasty burger…”
I also vote for FireUnderpantsBoobs because I laugh every time I see it. Also, Quasimodem is quite clever.
I would have to say FireUnderpantsBoobs too.
Someone registered, but I don’t believe was allowed to keep holy shit I like pie That will remain my favorite SN ever.
I always liked broccoli!, but I think it was for the exclaimation point. Where has he been, anyhow?