...wait for his 1000 page (OK, perhaps a slight exaggeration there but it was at least a hundred pages) document to print, meaning that when the paper tray (and in this instance ink) inevitably needs refilled he can do it, instead of buggering off somewhere?
The next unsuspecting victim (me) has to do all of the above and then wait for 20minutes until all the git's previous user's crapola has printed (I just needed to print one page on this occasion).
I know I'm a bit overly-ragey about this but in my defence it happens all the time!
And I need more 