I am known everywhere as a criminal, yet I have never done anything illegal. I always have an inside angle on you, and there are two of me for every one of you. What am I?
I am... the crook of an elbow! The crook is called a crook (obviously), and as your arms are on the side of your body, the insides of your elbows most nearly always have an inside angle on you; it's not psychological at all! And for every arm is an elbow, so two elbows means two crooks of an elbow per person.
Hai con chó đang lang thang ở công viên. Con chó trắng tên Đen, con chó đen tên Trắng. Nam thấy chúng dễ thương, liền thẩy trái banh ra xa rồi ra lệnh “Đen, đi lượm trái banh”… Đố bạn con chó nào sẽ đi lượm?