Fleetfoot has one day each year to release her negative emotions... Negative emotions that end in flipping off her teammates and a whole bunch of swearing.
A little after Babs' departure from Ponyville, Silver Spoon and Diamond Tiara decide to resume their cruel antics. After Apple Bloom mentions it in a letter to Babs, strange things begin to happen to Diamond and Silver.
When Spitfire invites Rainbow Dash to the Wonderbolts HQ, what is supposed to be paying a crash bill, turns into much more wild events of this Friday night.