A friend of mine bought a pair of boots from a chain store, but when he arrived home with them he discovered that the box contained two right feet.
The next day he returned to the store and explained the error to the assistant. “I’ll just check the stockroom to see if we have another pair” she said.
She returned a few moments later. “I’m really very sorry sir. You won’t believe this, but the only other pair we have in your size had the same problem, except there are two left feet”!