April Fool?s Day is rubbish once you're past the age of about eight, but the games industry seems to have bucked this trend a fair amount. Look at Volition with their Ostrich Hammer, for example.
What originally started as some dedicated gamers (read: twitpots on NeoGAF) slagging off Red Faction: Guerrilla eons ago became a brilliant send-up of said pots of twit, then went on to become an actual in-game item. Brilliant.
It's a sign that it isn't just the BBC and hecklerspray that pull out incredible April Fool?s??s?.