Velm: HL2 is funniest if you ask me, zombies are hilarious when on fire.
The zombie at start of Ravenholm is funny (though zombies come before him if you wait for a few seconds at start). You don't think that Glados is hilarious?
Ordworse: Episode Two ftw. That's the best. And... portal too. I loved it,but it was too short -.-
Well, the final Strider battle in HL2EP2 was brilliant. But... I still think that Portal is the best. Best puzzler of all time. Ravenholm chapter in HL2 is brilliant! No guns you have to use, just a gravity gun with a saw! The saw, gravity gun and portal gun = ftw. Lol you could find a Lambada (or is it Lambda... I forget) by grabbing a saw, throwing it onto a wall, then getting a wood plank and running onto the plank onto the saw and over, and there! AMAZING.