It's just a light that shines real bright, and bounces off a screen.
4 seconds sound clip from The New Adventures of Winnie the Pooh - Pooh Oughta Be in Pictures (S1E1).
You can hear this line at 00:08:14.385 in the Blu-ray version of the TV Series.
Quote context
[...]
- Oh, don't worry, Piglet. He's not in the movie.
- It's just a bunch of movie tricks to make you think this thing exists.
- A piece of film is all it is. There's really nothing there.
- So you'll be all right, 'cause it's just make-believe.
- It's just a light that shines real bright, and bounces off a screen.
- So you'll be all right and quite safe, too.
- There is no need to be scared when a Tigger has a Pooh!
- And don't forget Christopher Robin, too!
- There's nothing to fear when your friends are here with you!
- See you in the Hundred Acre Woods! Hoo hoo hoo hoo hoo!
[...]