I want Half-Life 3 too 
All you need is a crowbar and yourself.
Remember to whack ANYONE that looks like a zombie, sounds like a zombie, or portrays any zombie-like characteristics (headcrabs, insatiable taste for human flesh, walking upright...)
Remember that Barneys are your friends, but that you can whack them if they step out of line, too.
...and remember, guys in camo and black jumpsuits are your enemies. Unless, of course, you're playing Op:For 3, in which case you only have to watch out for assassins.
