Fall Through Solid Floors

From Glitches

From the game Sword Master for the NES.

Sometimes, when walking across a solid floor, the knight will fall right through it to his death. This seems to happen a lot to me on the second level boss (there isn't even a pit on-screen there!), and on the stage with all the purple walls and spears shooting out of the floor.

Taken with permission from Flying Omelette.