1. The most embarrassing surname: "Gao" If you have this surname, it's not easy to explain. There are few words associated with "Gao", and it's awkward to use the character decomposition method. Indeed, if someone asks you: "What's your surname?" and you say: "Gao". Then they ask which "Gao" character? You can't possibly say it's the "Gao" in "testicle", can you?