Dancing like Kamaro
Kamaro's Mask is one of the 24 Masks in Majora's Mask. It is received after talking to Kamaro. Kamaro can be found on one of the mushroom-shaped rocks in the snowy region of northern Termina Field.
When Link wears Kamaro's Mask, it gives him the ability to dance like Kamaro's spirit.
If Link goes to West Clock Town at night, he will find the Rosa Sisters trying to choreograph a dance for the Carnival of Time. If Link stands in front of them and performs the dance, they will learn it, and give him a Piece of Heart as a token of gratitude.
In Majora's Mask 3D, wearing the mask attracts Dancing Sea Bream in the Ocean Fishing Hole.
Link wearing Kamaro's Mask and demonstrating the dance for the Rosa Sisters