Run Extremely Fast

From Glitches

From the game Super Mario 64 for the Nintendo 64.

This best works with the moat area outside of the castle, so drain the moat first. Go to the slope by the entrance to the basement that leads up to the grassy part of the area. Long jump onto the slope from the bottom of the moat and continue running. You will be running really quickly as long as you continue running around on the slope. If you stop, leave the slope, or turn to sharply, you will return to normal.