Twilight Zone Trivia

One of these is not like the others. Only a true Twilight Zone fan will know which. I knew right from the start. But, do you?


[The YouTube]

By the way, if you have to guess, you'll probably not get it right. But, if you know, you know. I'll give you until tonight.

Okay, if you want a hint (another one; yes, you already have one), it happened on the show three times, but only once in this video. That ought to be a useless enough hint.

UPDATE: The answer is in the comments.