To use this cheat, you must be Wario, or at least another playable character wearing a Wario cap. First have the owl lift you to the top of the mountain in Tall, Tall, Mountain, the hit the red box. Grab the Power Flower, and you will turn metal. Go down the waterfall, and you should be where the monkey is. Grab him, and go in the water. Once you're normal, you'll float in the water. Get out, and what the monkey will say, "Ukkiki...wakkiki...kee kee! Ha! I snagged it! It's mine! Heeheeheeee!" If you're not playing as Wario, you'll turn back into Mario, Luigi, or Yoshi. But the weird thing is, the monkey will be wearing Wario's cap underwater!