The best way to piss off IM contacts during office hours

With the Pearl, built in Yahoo! Messenger is always a boon. Since I don’t hold straight hours in the office (I’m a “full time” consultant) I get to go out more. Of course, you don’t really need a Blackberry to do this (IM via GPRS / EDGE) so the best way to piss off office folk would be to watch Frank Miller’s 300 on the opening day (it opened here in my country today) and state the obvious on your IM status.