One-Legged Man's Name

Listen here, you're about as sharp as a marble. The 'joke' plays on the stereotypical pronunciation of 'tie one shoe' which sounds like 'tie won shu', a play on Chinese name. It's a pun, see, and also makes fun of a dude's missing leg and his ethnicity. It's all about word sound homophony, you dense rock. The humor is based on a misinterpretation and the stereotype.