Puts me in mind of some naval test of the Sea-something (Wolf?) short range defence missile. It was decided that the thing should be tested against a shell fired from one of pusser's warship guns...
So on the day the order was given. 'BANG' went the gun, the missile sensed, launched, tracked and zapped the shell before it was barely out of the barrel.
Cue the signal from the warship "Seems like we shot down your rocket, chaps!".