Has anyone ever had this happen?

I got ready for church this morning, have not even had to turn buzzer on at all for quite some time and so did not have the thingy with me so that I could turn it on if I wanted to. I left for church, by car...parked the car and went into the church.

Well, lo and behold, I started feeling that buzzing in both leg and bum areas! Had to go back home so I could turn it off!

How in the world could it have turned on all by itself? It's a mystery to me!