UniKitty!

Prank War (2x21)

:

When Master Frown starts a prank war with UniKingdom, the friends are ready to strike back. But Unikitty doesn't really understand pranks, thinking they're too mean. Can the friends help Unikitty comprehend a proper goof and win the prank war with Frown? Or will they be forced to suffer his tricks without retaliation and admit defeat?