Cow and Chicken - Season 4 Episode 8 Send in the Clowns
Overview: Dad isn't friendly terms with the new neighbors, who happen to be clowns. Cow falls in love with the clown son, who in return falls in love with Cow. They play hooky to spend the day together. Dad finds out, and Cow in grounded, while he kicks the clown son out, and chews clown dad out.