Here's an interesting novelty item from 1937. All you had to do was eat 15(!) Clark Bars and save the wrappers to get three packages of Teaberry, Peppermint and Sweetwood Gum. This is back in the quaint old days when people ate sawdust for fun and would think "Sweetwood" sounded tasty.
The image is a little hard to read, but on the side they suggest: "Try eating a Clark Bar every day between 3 & 4 PM. Drink a glass of water and see how much pep you have when the day is done." I like the way they have to specifically mention that you should drink some water as part of this regimen. Did people have to be urged to drink water back then? In either event, I don't know about you, but I really don't want to be full of pep when the day is done. I want to go to sleep. However, this plan of action helps explain how you could quickly accumulate 15 Clark Bar Wrappers so that you could chew manically on your Sweetwood Gum at one in the morning when you can't sleep.