Little Boy Only Laughs At Donkeys
Let's face it. Donkeys are pretty funny. Everybody knows the real star of Shrek was in fact Donkey. He was hilarious. In general they're kind of a sillier version of a horse. Closely related to horses donkeys are not nearly as domesticated, which has lent them a reputation for being stubborn. This legendary personality trait even helped the donkey become the symbol of a political party. As the democratic politician of the era, Andrew Jackson, was equally as stubborn as one, famed cartoonist Thomas Nast drew him as a donkey in a political cartoon.
Clearly the baby in this video has either seen Shrek, or is familiar enough with politics to find complete and utter amusement at the mere sight of this expressive animal.