We ran a scout activity night where we created a story based around the theft of a code that secures the scout gun store. This code had been 'encrypted' as a series of Insect stickers, and distributed around the neighborhood. Each sticker had a message describing how to find the next, and displayed an image of part of the code.
The scouts were split into teams and given a phone loaded with the images and sound files, and then sent out into the night to follow the trail.
In these days of technology I didn't think there was anything that I could present to them on a phone that would amaze and entrance them. How wrong I was. Quite simply, they loved it.
I think the mix of James Bond style gadgets, and sneaking around, was not something they had done before.