Creepy IM

So it's just about the end of the day at work when I receive this really bizarre IM. At first I thought it was a random IM from someone I knew from college, but apparently not. Here's the excerpt from my conversation (I replaced his actual screen name with 'Creepster')... thoughts?

(5:41:47 PM) Creepster: hi
(5:42:40 PM) Me: whos this
(5:42:52 PM) Creepster: mj, i saw u on my buddy list ha weird?
(5:43:16 PM) Me: mj. cmu mj?
(5:43:55 PM) Creepster: cmu?
(5:44:04 PM) Creepster: whast tha tmean
(5:44:07 PM) Me: nm
(5:44:08 PM) Me: do i know you?
(5:44:14 PM) Creepster: uh i dont think so
(5:44:15 PM) Creepster: asl?
(5:45:46 PM) Me: this is not a personal IM
(5:45:53 PM) Creepster: oh it isn't?
(5:46:07 PM) Me: so please don't IM me if it isn't work related. thanks
(5:46:13 PM) Creepster: what kind of work
(5:46:15 PM) Creepster: just curious?
(5:47:10 PM) Me: please don't IM me if it isn't work related. thanks
(5:47:15 PM) Creepster: ok