Prior to my soph. year at Ohio University they installed phones in each and every dorm room on campus. The phone number for my room was one digit off from the number to reserve racquetball courts at the Student Center (Grover Center for those who are familiar). And in the 1980's racquetball was very popular and it was a must to reserve ahead of time to get on a court.
My roomie and I used to get wrong number calls all the time for racquetball reservations. At the suggestion of a friend... we starting reserving courts and times for all the "wrong number" calls. We'd answer like usual, "Hello." The caller would say, "Uh, ummm, is this Grover Center?" We say, "Yep. What can I do for you?" We'd tell them that they could have court #4 at 12:30 pm this Saturday. Never found out, but I'd assume that there was a lot of fights and arguments going on at Grover Center when people showed up for their reservation and there was no court for them!
The things we do when we are young!