Why do emos suck at playing tic-tac-toe on their wrists?
Because when they win, they lose.
Emo Tic-Tac-Toe
Explanation
Explain Bear
Listen here, kid. You see, emos are known for being sad and stuff. So, the joke is that even when they win at tic-tac-toe, they still feel like they lose, because, well, they're emos and being sad is kinda their thing. And you, well, you are the least silly person I have seen today!