Brush of Foolishness

The Brush of Foolishness is a treasure in. It is actually a blue toothbrush.

Collecting the treasure
The Brush of Foolishness is on the northwestern corner of sublevel 3 of the Seafloor Resort, next to a pile of Gold Nuggets. To collect this treasure, you must first press the nearby button with a Pikmin to lower the iron fences, then throw 5 Pikmin at it.