I always do that for good luck.
3 seconds sound clip from the The Big Trail (1930) movie soundboard.
You can hear this line at 00:08:44 in the Blu-ray version of the movie.
Quote context
[...]
- There you are. Now it's bound to be under one of them.
- There's one, there's two, and there's three.
- Now we'll shuffle them just a little bit, just to confuse you. And take your choice.
- Now wait, I show you. Here, I bet you two dollars.
- I always do that for good luck.
- Now wait. I show you. Now watch.
- Ah, you see, Gussie, the hand is faster than the eye. Better luck next time.
- Oh, here. Who wants to buy my mother-in-law's stocking?
- Gus! Oh, there you are. What do you mean by spending my money?
[...]