Before I switched to mentalism the Bill in Kiwi use to be my closer for the show. EVERYONE would talk about it...Its been years and people still remember the bill in kiwi (some describe an orange although I never did it with an orange).
You can't go wrong with Carl's version. The bill is signed and the kiwi is handed out before you touch the bill. I wish this was a mentalism effect
Hey Benji, you can always get them to write down any fruit on a billet, sign it, date it, or whatever and say that you have your prediction in this bag (kiwi) and hand it to someone. then you given that guy the billet, switch it and open the bag and produce a kiwi and say am I right? If it is, trick ends there. if it doesn't (most probably), you can then proceed to cut out the kiwi and reveal their billet inside the kiwi.
Just an idea. Let me know what you think.