"Best day ever!" cheered Rainbow Dash.

"Haha alright Rainbow Dash that's enough," said Princess Celestia.  Her horn glowed and a flash of light consumed Cloudsdale.  

Rainbow Dash opened her eyes.  She was laying in her bed.  "What!?  It was all a dream!" she yelled.  She kicked her hooves out in frustration.  

Princess Celestia laughed hysterically in her castle.  It hadn't been a dream at all, Rainbow Dash just thought it was.  And everypony's memory was wiped.  She fell to the ground in tears, still laughing.