The Ladybug and Cat Miraculous

Rena Rouge's illusions of Ladybug and Cat Noir decide they're in over their heads and remove their Miraculous (resulting in fake alter-egos of the heroes as part of the illusion). They then throw their Miraculous into the pool. Mr. Pigeon dives in... only for Plagg to nab his whistle on the way down. Rena Rouge then waits until Mr. Pigeon gets close to the fake Miraculous before dispelling the illusion, granting Plagg some extra time to flee.

Example of:
Fakin' MacGuffin