"Wait," said Sunset. "You're saying Old Holly Hooves isn't real?!"
Her friends all looked at her strangely.
"...Well. Yes." Twilight nodded. "I mean, it's scientifically... I guess not impossible, strictly speaking, but—"
"I put up a stocking every year! I've been doing it since I was a filly! And every year, it's been filled!"
"Generally it's the parents that—"
"Every year, Twilight! Including the ones I was here!" Sunset shrugged. "Granted, I tended to get coal, but I assumed that was just a quirk of this reality."
"...oooooookay. That's... actually kind of weird."
"Hey," Pinkie spoke up. "If you're kind of omnipresent, can't you just, I dunno, go find Old Holly Hooves yourself and ask him if he's real?"
Sunset blinked. "Well... maybe? He's probably busy around this time of year, though. I'll just wait till summer."