Public Information Film - Leave Bombs Alone 

That must be the funniest ever advert that was not intended to be so!

I say look out there's a bomb you've go there. My your own bleedin' business I am having it away to sell on EBay in sixty years time. Cycles off sing "Knees up mother Brown". Explosion One lone bicycle wheel rolls into shot. Announcer says in a sombre voice " Never pinch bombs...make your own"