Dont forget shepherd

[jimmyjam]

well clearly the top of the barnacle adheres to surfaces in some way, and thus could stick to your arm... though I've always preferred to think that adrian just shoved his hand through the flesh and started squeezing
the electric-arm-crab thing (shockroach/shock-rifle) is just held... how lame

 

[kupocake]

I never really understood how Freeman was able to use the Hive Gun though... I mean, that thing was pratically an arm for the Alien Grunts...

 

[Jenga]

maybe he grabbed some nerves and started pulling on 'em