The Twilight Zone (1959 TV series)
Honestly nothing will ever top it, I remembered growing up hearing that eerie song at about 11 o'clock. I wouldn't say every episode was a masterpiece but they all made me think a little different.
I loved them all but my favorites were:
The Monsters Are Due on Maple Street, S1 Ep22
Number 12 Looks Just Like You, S5 Ep17