Dawn of the Dead (1978)

[Roger is in bed, slowly dying from a zombie bite]

 

Roger: You'll take care of me when I go, won't you, Peter?

Peter: Rest, man. Save your strength.

Roger: I don't want to be walkin' around... like THAT!... Peter...

[Peter is turning away, not ready to cope with the death of his friend]

Roger: PETER?

Peter: I'm here, man!

Roger: Don't do it until you are sure I am coming back! I'm gonna try... not to... I'm gonna try... not to... come back. I'm gonna try... not to...