Twilight Zone-"Long Distance Call" (1961)

The tale of a dead grandmother communicating to her grandson via a toy telephone is absurdly amazing.  Telling him to commit suicide to be with her is even more amazing.  Adding to the creepiness is the fact that you never actually hear the dead granny's voice on the other end of line.  Indeed, very sweet and sentimental if you think about it.  

The videotape (then transfered to film) production makes it a little less enjoyable than most to watch but this is still a wonderful storyline.  Here's the first part of three (see for yourself the weird shots and cheaper production. Good thing they didn't shoot many TZ episodes like this) :