For me, Withered Sonic's jumpscare is the most creepiest one in the game.
Made in Fiercy Forces version (above fanart).

Cuz this Boi makes a spin...

"You spin me right 'round, baby
right 'round like a record, baby
right 'round, 'round, 'round!" (A joke)

Really... like a crazy!

And the fanart was made based on this one... (taken from one of the frame):

(And of course the picture is not mine)

(So have this fanart for today... that's all from me.)