What’s the difference between an orphan and Pikachu?
Pikachu, I choose you!
What’s the difference between an orphan and Pikachu?
Pikachu, I choose you!
Alright, listen up, buttercup. This joke is playing on the fact that orphans don't have parents to "choose" them, while in Pokémon, trainers get to choose Pikachu as their Pokémon. See? It's funny because it's sad... for the orphan. And you, probably.