We used to do exercises like this all the time and they are great for problem solving "BUT" I can imagine a few parents complaining when their little Jonny/Janet comes home telling them about the "bomb" they had to carry. You can do exactly the same exercise but just a different risk i.e say it's fragile eggs instead etc and avoid any potential "Daily Mail" issues!
The parents already know what we're doing as it's a
Themed camp for the Beavers!!