<p>Here’s one for you. We were getting extra keys made for our house and my son asked that we make an extra key for his apartment to be left at our house. When we went to have them made, the locksmith thought the keys were the same. We assumed our son gave us the wrong key. Turns out it was the right key and his apartment key opens our door while our house key won’t open his. I’ve always assumed that someone has a key that will fit your door. This is the first time I’ve found one.</p>