There is a military exercise.
For economic reasons, the bridge is not blown up, but a sign is posted on it:
“This bridge is blown up!
” The general observes the situation of the military exercise through binoculars, until suddenly he sees a platoon of soldiers walking across the blown-up bridge.
He is in an unbridled rage, almost thinking of court-martialling the whole section…
Full article: https://www.bikuci.hu/vicc-hadgyakorlat-van-takarekossagi-okokbol-nem/