In the old movies, zombies were slow and stupid even, moving much like a retarded 80 yo old guy, where seemingly a simple push could get them off of your back. Over the years/movies, they got stronger, faster and even smarter.
Has anyone seen the latest Zombie flick which was another mutation from the original George Romero's Day of the Living Dead, but I am not sure what the name of this one was. I think something like "The Day of the Freaking Dead".
Zombies in that movie were crazy fast, strong, jump/climb high and hella agressive!

Toss some LPs on those guys if you can!!