Do you get excitment out of being sneaky even when its not necessary?

I’ve noticed that people will try to be deceptive even when there isn’t any reason to be, and my theory is that they like feeling like they are getting over on someone else or that they have a little secret or something. Its actually pretty amusing. Do you do this? Why?

My concern is that if someone does this all the time it will make them lie about things that DO matter.