The Art of No Mind - Ninja Monkeys attack the Valley and they appear to be invisible. They're invisible to all but Ox. When Ox and Skunk save the day, however, Ox loses his ability to see them.
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Rabbit: Here's your clean laundry!
Skunk: Rabbit, I just finished the best animal fools joke ever on Master!
Rabbit: *gasp* An animal fools joke?! How frightening!
Skunk Fu! - The Art of No Mind