Cutie Mark Day Camp.
Rumble throws a wrench in it.
He soon regrets it.
http://tvtropes.org/pmwiki/pmwiki.php/Haiku/MyLittlePonyFriendshipIsMagicS7E22MarksAndRecreation
FollowingHaiku / My Little Pony: Friendship Is Magic S7 E22 "Marks and Recreation"
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