Bottles and Kegs, in a vaguely MVC style (and without jQuery).
"Bottles and Kegs" is a drinking game, where participants sit in a circle and count out loud. The first person says one, the next says two, and so forth. When somebody says the wrong thing, they take a drink.
Sounds like a pretty boring drinking game, doesn't it?
The problem is that when the number is divisible by five, you're not supposed to say your number, but instead say "bottles". And when it's divisible by seven, you're to say, "kegs". And if it's divisible by five and by seven, then you say "bottles and kegs". Just those words in that order. And the next person, the one next to you who just heard you say "kegs"? They have to start the count at the correct number. Which is whatever number you would have said, but didn't, plus one.
Now is it starting to sound more interesting?
The problem is, your friends always want to play Bottles and Kegs, and you always lose. This was fun at first, but midterms are coming, and you need to win a little or you're going to flunk out. Don't worry; we've got you covered.
Here is a handy-dandy app which will help you win. Just load this baby up on your phone and when it's your turn, put in the number you're on and hit the button. Just say what we tell you and you'll (probably) make it to morning.