Stop the Pits From Expanding

From Glitches

From the game Metal Gear for the NES.

When those pits open up in the floor, if you go to your Transceiver screen, the pit will stop opening up. When you return to the normal game screen, the pit will appear to be gone, but actually still be there. It'll only be as big as it was when you changed to your Transceiver screen, so now if you can remember where it was, you can safely go around it.

Taken with permission from Flying Omelette.