Return of The Living Dead was the first zombie movie where the zombies were capable of moving with any speed and the mix of horror and extremely black humour makes it a classic.

Paramedic #1: You have no pulse, your blood pressure's zero-over-zero, you have no pupillary response, no reflexes and your temperature is 70 degrees.
Freddy: Well, what does that mean?
Paramedic #1: Well, it's a puzzle because, technically, you're not alive. Except you're conscious, so we don't know what it means.
Freddy: Are you saying we're dead?
Paramedic #2: Well, let's not jump to conclusions.
Freddy: Are you saying we're dead?
Paramedic #2: No conclusions.
Paramedic #1: Obviously I didn't mean you were really dead. Dead people don't move around and talk.