Pinkie Pie:[In front of Firefly and Rainbow Blaze, clears throat] I have a confession to make. I lied about being stupid. I just acted like a fool so you would appreciate Rainbow Dash a little bit more. I know how to talk, and eat, and do laundry. I even separate the darks from the lights. So what do you say we start over and try again? Hi! My name is Pinkie Pie. And I am not a dummy.
 
Rainbow Blaze:[laughs] Amazing! Three minutes in the kitchen and our son has taught him to talk in complete sentences. [Puts his right thumb up] Oh, good work, Dash!
 
Rainbow Dash:[Puts his left thumb up] It wasn’t easy, dad.
 
Pinkie Pie:[sputtering] But… but, but, but, but, but, but…
 
Firefly:It looks like it’s time for your next lesson, young lady!
 
Pinkie Pie:Now, listen to me! I’m not dumb! I have a brain! See? Here’s a picture of it! [He shows them a small picture of her brain]
 
Rainbow Dash:That must be actual size. [All except Pinkie Pie laughs]
 
Pinkie Pie:No! It’s normal size and fully functional, watch. [Writes on Rainbow Dash’s chalkboard] 2 plus 2 equals 4.
 
Rainbow Blaze:Hoho, Dash! You taught her math, too!
 
Pinkie Pie:Noooo!
 
Rainbow Blaze:And you taught her to sing! [Pinkie Pie is blabbering and sputtering, then starts tensing up] Oh, now she’s short-circuiting! You must have taught her a little too much.
 
[Pinkie Pie imagines the three all laughing hard, because of Pinkie Pie’s intelligence. Rainbow Blaze and Firefly look at each other and laugh; then the three pegasus all do the can-can. She imagines the three popping out of Pinkie Pie’s hair. Pinkie Pie is inside Firefly, who is laughing, inside Rainbow Blaze, who is also laughing, inside Rainbow Dash, who is also laughing, inside his eye.]
 
Pinkie Pie:[Screams at the top of his voice, then starts running towards the wall, crashing through the wall outside, running all the way back to ponyville]
 
Rainbow Blaze:You know, Dash, I’ve always known that when it comes to brightness, well, you’re about a three-watt. But this guy! She’s a wet match in a dark cave. She makes phone operators seem smart! [clears his throat] But more importantly, Dash, She’s shown me what a sharp, quick-witted girl you’ve become. [Hugs her] ] Ha! I feel like I’m really meeting you for the first time. Isn’t that right, Firefly?
 
Firefly:You bet, Rainbow Blaze!
 
Rainbow Dash:[Her eyes widen] Firefly?! Rainbow Blaze?! Who are you ponies?!
 
Firefly:Blaze, I’m scared! [Doorbell rings, then the Rainbow Dash’s House opens up. Princess Celestia, Bow Hothoof and Windy Whistles are outside Rainbow Dash’s House]
 
Princess Celestia:Excuse me. Does this lovely couple belong to you? They’ve been standing outside Canterlot saying “Where’s Rainbow Dash?” all day! It’s driving me nuts!
 
Rainbow Dash:Mom! Dad!
 
Bow Hothoof:Wow, Rainbow Dash! You actually recognized us this time.
 
Windy Whistles:And you remembered to get dressed today! [Rainbow Dash, Bow Hothoof and Windy Whistles laugh]
 
Rainbow Blaze:Oh, that’s right, honey. We don’t have a daughter.
 
Firefly:Oh yeah! [Both walk away. Rainbow Dash and her parents laugh as their Rainbow Dash’s House closes over them, then the screen fades to black, ending the episode]

I like this

Even though we know these aren’t Dash’s parents now, I like to think that they’re her super awesome aunt and uncle.