[robotpony]

An app that lets you track the last person to buy beer in a group of friends by taking their picture. With an in-app-purchase, you can ensure that the next time you meet that the app lists yourself as the last beer-monger (while still retaining the history accurately otherwise). Great for that manager or boss who never pays his share.

[DanBC]

Don't buy rounds - they lead to excess drinking. People should be buying their own drinks.

[niix]

But what about those of us who like things like lead to excess drinking?