I like making up some funny phrases out of connecting some of the announcer board things...
e.g.
Red Demoman on Toilet Pushing Cart
Pyro Is Man Is Woman (?!?)
Red Medic Drowned Blue Spy
Sleeping Blue Heavy Needs Roommate
Red Scout Team Update Vaporized
Red Sniper Smells In Surgery
Red Heavy Behind You!
Blue Spy. Found Dracula. Lost Briefcase.
Red Spy Has Evil Twin: Blue Scout
Blue Scout is a Robot: Again Hit by Train

Edit: Another Few
Blue Pyro Smothered Opened Briefcase
Red Medic Needs a Ride in Surgery
Blue Demoman Depressed. Is drunk. About to Explode