The Problem with Things that Shoot . . .

No, it is not that brothers get shot. I can deal with that. It is not that things get broken, I just take the gun away when that happens. The problem with things that shoot is invariably the ammo goes over the fence. Stephen shot his bazooka over the fence today. And I forgot to go get it this evening . . . and I don't think the neighbors would appreciate me knocking on the door now at 1am . . . and I think they work which means now I have to remember to do it at around 7pm tomorrow night . . . and that's a long time for me to have to remember something. Is there a way to tie the ammo to the bow or gun?