When I started as a first year university student, I joined a queue with other students to get a locker allocated and receive a key. Bored, and for not particular reason apart from boredom, I asked myself whether the key would be no. 521. When my turn came, some 15 minutes later, I was given key no. 521. I was so surprised I at first did not take the key and asked why I had been given that one. As can be imagined, I was given an odd look and asked what was wrong with it whereupon I took it and left.
In the queue, I had not guessed lots of different numbers, just the one.