Rabbit Beams are enemy traps found in A Link to the Past.
A Link to the Past
Rabbit Beams are traps that first appear within Skull Woods. Usually found underneath certain pots or large rocks, these beams consist of five revolving stars. They will chase after Link and if they come into contact with him, they will temporarily disable the effects of the Moon Pearl, transforming Link back into Bunny Link. Fortunately, this doesn't last long as after five seconds, Link will revert back to his normal form.
Link is defenseless while he is in his Bunny Form. If Link gets hits while in Bunny form, he will immediately revert back to his normal form.
Despite seeming invincible, Link can defeat a Rabbit Beam with any of the three Magic Medallions.