My wife and I were looking for something to do last night.  We agreed on bowling.  We got in the car and drove to the bowling alley.  We went to the front desk.  The people at the front desk were very nice.  They asked us how many games we wanted to bowl. I wasn't sure, and I looked at my wife.  We decided we would bowl two games.  They asked us what size shoe that we wore.  I told her that I wore a size 11.  The lady got me a size 11 shoe and told us to go to lane 2.  My wife also wanted a drink, so we went to the concession stand.  We bought a soda and went to lane 2.  We both put on our shoes, and then we searched through the balls to find ones we liked.  Once we found our shoes, we began bowling.  I went first, and my wife went after.  We exchanged turns throwing the ball, and we kept each others score.
How did they keep score?