Instead of bananas, I start selling custom printed t-shirts. Each shirt has a unique QR code printed on the front that, when scanned, reveals a private key to a funded BTC address. I can charge more than one would usually pay for a t-shirt because each one is unique, see.
If I wanted to really be sneaky, I could send two shirts to each customer. One has the QR code the buyer specified upon ordering (a random message, a URL, etc.) and the other has the private key QR code (How did that get in there? My cousin must have accidentally packed a personal shirt of mine! Darn my nepotistic hiring practices. I guess I'll never learn.
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)