Relay Heihō

Relay Heihō are bomb-dropping Boo Guys from Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, and Yoshi's New Island.

Super Mario World 2: Yoshi's Island
In Super Mario World 2: Yoshi's Island, they are found stationed in long rows within the ceilings of certain castles. They relay a single purple bomb, dropping it when a Yoshi approaches them. The Yoshi can perform a Ground Pound to force them to drop the bomb. If they miss, the one who dropped it will hang its head with an ashamed expression, with them starting over a few moments later. Due to their position, they cannot be defeated.

Yoshi's New Island
In Yoshi's New Island, Relay Heihō act the same, though they no longer change expression when the Yoshi ground pounds.