I remember, in Duke Nukem 3D (or 64, or Total Meltdown, depending on what system you have) Dukematch, you could turn on invincibility and then use the Shrinker to shrink someone. You would then pause the game, turn off invincibility, and stop shrinking the guy. He would never grow back. Alternately, you could leave invincibility on, and stomping on the tiny guy would yield tons of weapons. In addition, when using the Expander, you could shoot the guy with it, and just before he explodes, turn on invincibility. He would keep on playing as a giant. There was also a glitch where you could kill yourself with a pipebomb, and as the screen turns red, pause and turn on invincibility. If you had any Dukebots in the game, you would be invisible to them (because you'd be (un)dead).