Rabbit Beam

A Rabbit Beam is a trap in A Link to the Past that appears commonly in later Dark World dungeons. It will wait in place, often hidden under objects or walkways until it detects Link, upon which it will fly straight at him. If it hits something else before reaching him, it will vanish, but if it hits Link it will disable the effects of his Moon Pearl and turn him into Bunny Link. Unable to fight, Link will be helpless for a short period of time until the curse wears off, or until he is hit by an enemy attack. Rabbit Beams will commonly appear alongside other enemies so as to leave Link vulnerable to immediate attack.

Trivia

 * Despite seemingly being invincible, Rabbit Beams can be destroyed like any normal enemy by either of the three Magic Medallions.
 * Rabbit Beams have a similar effect to Bubbles from the original The Legend of Zelda, in that they temporarily curse Link to a state where he cannot use his sword. They also look a lot like a Bubble made of stars.