beads started vibrating

An expression that refers to a situation in which someone starts to perform better than before.
Context: World chess champion, Magnus Carlsen, accuses Hans Niemann of cheating after losing to him. Wild theory is that Hans used programmable vibrating anal beads to cheat in the game.

After being behind in the quiz competition for the first few rounds, his beads started vibrating as he finished first, trumping in the last two rounds.

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