Snorting and bouncing on the big ball

Aunt Tami started doing a thing with Luke where she holds him and bounces him up and down sitting on the exercise ball. He gets pretty high and loves it. He calls this "Up". This week she was doing it and all the sudden each time he would go up in the air he would let out a snort. At first I thought he was just laughing and a snort just made its way out, but then everytime he would go up he would snort. Soon Tami and I realized he was purposely snorting when he was up in the air. It was so funny to watch and we started laughing so hard our stomach's hurt. He still does this everytime and we have no idea where he got the idea to snort but he must think it is part of what he needs to do when he goes up!