This was in their foyer and caught my eye before we left (while waiting for a few of our fellow travelers to use the restroom). I finally asked the hostess to explain it. It's an antique. Each month the restaurant chooses two different non-profit establishments in their city to benefit. For every pint of ale you purchase you're given a token at no extra charge. As you leave, drop the tokens into the slot of your choice. At the end of the month this restaurant counts how many tokens are in each slot and gives that establishment the equivalent of $.25 per token.