Possible project: Airsoft M1a1 Bazooka

A Nerf rocket howler is possibly heavy enough to make a good thump on the side of the tank, and I still love the whistle they make.

The bazooka could be really easy too build, Look at this link: http://www.youtube.com/watch?v=4oeAbZxjhOM *** O.K, if you do something like that from the bazookas trigger machanism to the end of the bazooka you could do like he did with the laucher, you get 1 of those madbull rounds and make a pipe too it so it can so you in the bazookas end (and you got a bazooka round) and then just pull the trigger when loaded. (when all things is done) i'm not so good on explaing things so i think you'll have to look at the whole video on the link to get it.