The Sonic Rainboom "unlocked" Twilight Sparkle's magic. When her errant magic went haywire, it sent Twilight and Spike's unhatched egg to another universe - ours, specifically. A person discovers little Twilight and unhatched Spike and proceeds to have a conversation with Twilight.
Re-posted from FanFiction.
You lost me at "unhatched egg"...
That was pretty good.
That was interesting ^-^ the props, I bestow them upon you
Rainbow In The Dark - Dio
Nice. Reminds me of My Little Dashie.