Rainbow Dash in her astronaut costume laughing at Wind Whistler (from G1 My Little Pony series) who is inside the glass dome. Wind Whistler got angry and put her hoof down on the moon, Rainbow is laughing because she thinks it was a practical joke.
 
Rainbow Dash: (laughs)  
Wind Whistler: Rainbow Dash, get me out of this dome! This isn’t funny!  
Rainbow Dash: What’d you say, Wind Whimper?! I can’t hear you through the glass!  
Wind Whistler: You better let me out of that dome, or you’ll be sorry!  
Rainbow Dash: (singsong) Wind Whistler is a baby! Wind Whistler is a baby! Wind Whistler is a baby!  
Wind Whistler: Just wait ’till I get my hooves on you, you practical astro-joker pony!