My Little Pony: Friendship Is Magic Season 6 Episode 15 - 28 Pranks Later Episode Title:28 Pranks Later.Episode Description:Rainbow Dash begins a pranking spree around Ponyville, irritating her friends, who find her jokes unfunny and hurtful. Failing to reason with Rainbow Dash, the townspeople send Pinkie Pie—the only pony not offended by the pranks—to convince her to stop. Instead, Rainbow Dash divulges her plan to prank the entire town with joke cookies made to turn their mouths rainbow-colored, feeding one to Pinkie as a demonstration. Later, Pinkie falls sick with an appetite for more joke cookies while Rainbow Dash helps sell them around town. That night, Rainbow Dash checks on Pinkie to find that the cookies have turned her and everyone else in town into cookie-craving zombies. Once a terrified Rainbow Dash apologizes for her prank, the townspeople reveal the entire outbreak to be an elaborate prank devised by Pinkie to teach her to stop taking her jokes too far.