You were playing Grace, and you selected the modifier "TICKTOCK".. in the game you see a blue clock on your screen, the number on it was 6. Be sure to stop holding your shit quickl- oh wait you survived nvm.. (ahem!) The clock closes, revealing a blue smiley face with Xs for eyes.. they seemed to stick out their tongue, it looked like a clock hand.. then they started 'speaking'..

"Tick tockk!! XwX"

(Btw I headcanon Kookoo speaks like a clock (ticks and tocks)