Fountain of Truth
The Fountain of Truth is one of three fountains at Plum Park in Paper Mario: Color Splash. A yellow Toad stands by the edge of the fountain, having thrown coins in it to make a wish. Mario can go into the fountain to recover these coins, although when the water is poisoned, he takes damage doing so. When Petea Piranha is defeated, the Fountain of Truth is purified, and Mario can safely retrieve the coins inside.