This is the card you get if you work me while I'm mobile and you want a QSL card. This picture was taken at the Oklahoma, Missouri and Arkansas tri-corner, which some people collect.
May as well throw my hat in the ring... My actual printed ones have the address, gridsquare, ITU and CQ zones blank so I can fill them in by hand. I was almost positive I would change addresses before using the whole stack and I am about to prove myself right in the coming months! Very thankful I made that decision.
I once made a special QSL for the time I operated from the spot where the Kansas, Oklahoma, and Missouri state lines join.