I was fiddling around this morning and saw the word "leet" twice in less than a minute and thought, "WTF?" Well, that's leetspeak right there. Short for "elite," as in Internet gamers and such who get their kicks by replacing le77ers in emailez, you g3t the idea.. I had to check out the Wikipedia entry to get it to really register. 'Cause everybody probably does it a little bit, IMO.
Admitting to said ungrammatical behavior, this Star Wars trailer with leetspeak subtitles is laugh-out-loud funny.