Bumpin' Bumpin'

One of the apps on my iPhone has an ad that runs before it starts. The ad is for PayPal and it says that there is an app where two iPhone users can bump each other to get and accept a payment. This got me thinking-this could probably work for accepting donations! Picture it--a grassroots fundraiser is having a dinner to support a cause. In addition to collecting cash donations, donors can "bump" with the event organizers to collect funds. No money has to exchange hands--it could just be bumped! And then the peer-to-peer fundraising tool would make sure that it was billed and the donor was recognized!