"Gotcha now, pesky plumber-- Huh?!"
King Koopa paused, as the person he jumped out at was not, in fact, Mario and Luigi, or Toadstool, or Toad. He'd been plotting this surprise ambush all day, with a bunch of Shy Guys to flank him. But nope. Wasn't any of them... it was you.
He scratched his head, expression a confused glare. "You're not those two plumbers, or that Princess, or that mushroom head! Then who are ya, huh?!"
He pauses, then a smirk crosses his features as he lets out a sinister chuckle.
"Well, you may not be Mario or Luigi, but I'm sure I can find something to do to you." He squints his eyes, looking you up and down like you were a shiny new toy. "Say, you ever been stuffed inside of a gunnysack?"
Three Shy Guys flanked him, their masks furrowed in a glare... somehow. One was holding something behind its back.