RD - WHHHHHHHHHHHHHHHHHHHHY!?!?!
 
So while visiting an restaurant, Pinkie needed to go to the restroom, she accidentaly bumps with the chef, causing the restroom sign to fall off, Pinkie puts it back to its place, but she accidentaly has it pointing towards the restaurant freezer, when she realizes her mistake, she tries to leave, but she breaks the handle, Rainbow comes to investigate after realizing Pinkie havent returned, only to get stuck in the freezer too
 
If you are a 90s kid, you will easily understand the reference, if you dont, its from a certain live action show at nickelodeon about 2 best friends whose names begins with a K. cookies for these that catch the reference