Hot Rodder Goron

From Zelda Wiki.org

Hot Rodder Goron can be found in Goron City in Ocarina of Time. He will be rolling around on the third floor in a continuous circle, without stopping for anything (not even young adventurers who wander into his path). A sign posted nearby reads "If you can stop my wild rolling, you might get something great. --Hot Rodder Goron"

By placing a well-timed bomb in his path at the alcove near the sign, Link will be able to stop him, and he will reward Link with a bigger Bomb Bag.

A similar tactic is necessary for Adult Link to stop the young Goron named Link, who is rolling around in a similar manner seven years later. Link the Goron, however, will back off and roll in the other direction if Link gets too close.