Bandersnatch (Resident Evil: Code Veronica)
Why you wouldn't want to meet it up a dark alley: He's yer standard experimental bioweapon with a powerful extendable hand that can stretch great distances to punch around corners and stuff.
Movie monster we'd like to see it have a fight with...
Ash's Hand (Evil Dead 2, 1987)
Who would win? Bandersnatch Hand big and strong but always attached to Bandersnatch. Ash Hand strong and clever and free to roam and wreak havoc and definitely win.