One little slip like that can cause the Great Pumpkin to pass you by.
5 seconds sound clip from the It's the Great Pumpkin, Charlie Brown (1966) movie soundboard.
You can hear this line at 00:22:58.680 in the Blu-ray version of the movie.
Quote context
[...]
- You heard about fury and a woman scorned, haven't you?
- Well, that's nothing compared to the fury of a woman who has been cheated out of tricks or treats.
- Hey, aren't you going to wait, and greet the Great Pumpkin, huh? It won't be long now.
- One little slip like that can cause the Great Pumpkin to pass you by.
- Oh, Great Pumpkin, where are you?
- Well, another Halloween has come and gone.
- I don't understand it. I went trick-or-treating and all I got was a bag full of rocks.
- I suppose you spent all night in the pumpkin patch and the Great Pumpkin never showed up?
- Nope.
[...]