The hotshot Aussie pilots “buzzed” the virtual kangaroos in low flight during the simulation. The kangaroos scattered, as predicted, and the visiting Americans nodded appreciatively… then did a double-take as the kangaroos reappeared from behind a hill and launched a barrage of Stinger missiles at the hapless helicopter. (Apparently the programmers had forgotten to remove that part of the infantry coding.)
“—Jerry Pournelle, [1]” on reusing code.