There is no key to the front door of 10 Downing Street, the official residence of the British Prime Minister. The door is attended twenty four hours a day by a guard who is responsible for opening the door (and keeping it locked from the inside).
In the United States, the name for the letter Z is pronounced like “zee”, but in the rest of the English speaking world it is pronounced like “zed”.
In 1998, the Qualcomm Stadium in San Diego, California became the first stadium (and the only one since) to host the Super Bowl and World Series in the same year.
The character Toad and the other “mushroom people” portrayed in the Mario Bros. universe do not actually have heads shaped like mushroom caps, despite how they might appear on screen; they have normally shaped human-like heads and wear giant hats that look like mushrooms.