pesky - causing irritation or annoyance; “tapping an annoying rhythm on his glass with his fork”; “aircraft noise is particularly bothersome near the airport”; “found it galling to have to ask permission”; “an irritating delay”; “nettlesome paperwork”; “a pesky mosquito”; “swarms of pestering gnats”; “a plaguey newfangled safety catch”; “a teasing and persistent thought annoyed him”; “a vexatious child”; “it is vexing to have to admit you are wrong”
Maybe the joke’s on all of us - perhaps accounts are only allowed 9999 posts and Pesky is laughing at us all and awaiting Mr Admin to give him a new account! 
Yes, that’s him! 
Anyway - about this 10,000th post. It just occured to me that he might be waiting for some sort of anniversary. The first incarnation of Exiges.com died about 8 years ago but the original forum must have started in 2000. On there he was simply ‘Pesky’ rather than ‘Mr Pesky’ (and I was ‘83man’ as opposd to 'the 83man). Maybe there is a significant date and time coming up soon?
Am I right Rob? 
(don’t answer that until you are ready!)
So its like the millenium bug? Maybe he is worried about posting incase his computer blows up and his catheter starts running backwards.
He was Mrs Pesky for a while, wasn’t he?