Link's Awakening Glitches - Fishing Pond Glitching
Access the Fishing Pond, and have enough Rupees to play.
Basically you wait until a certain time where the fish at the top is in a certain spot, then you throw your fishing line and reel it in as fast as possible in a way that the fish will start running after the fishing hook, but Link will pick the hook back up before the fish can actually get it.
The fish falls down into the water and the game thinks that a fish has been successfully caught, when it isn't the case. You can repeat this as many times as you like and make the game think the pond is empty when it's still full :3
As shown in the video it is also possible to get the fish to swim inside the rock side of the pond as well which looks funny.