I always thought that was strange, I mean... First you're carrying a hunting rifle, and run quite fast, but when you get the knife, you walk really slow, but take out your gun again, and you're runnung again... Where did the mass of the knife go?
Oh. and to update my list:
Infested Kerrigan. (Starcraft: Broodwar, she looks sexy as hell on the front of the box/discbox)
Kain. (Same reasons as Jacob, but I also like Vamps... I wish there was an Angel game)
Voodoo Vince. (I mean, a walking Voodoo Doll, thats great!)
Pyramid Heads (The scene in SH2, when you defeat them for the last time rules!)
Gruntz. (Play Doh like figures, from an old Monolith game. It's fun!)