Well I am older than dirt AND a brat at the same time. When DSis and I were teens, I always stuck my tongue out at her during church ( up front in the choir yet! ) and made her laugh out loud while I looked innocent.
When I was a yound "adult" my DNephew and DNiece knew the rules about waving goodbye when you left a family gathering. Out the car window you make faces, roll your eyes, do armpit farts - as much as you could get in before the car was out of sight. And we did the same back.
Now that I am a grandmother age, I sit in church at the skilled care unit with my mother. I lean past my Dad real slow and stick out my tongue at Mom. Discreetly this time. She will usually do it back - lately though I've gotten the "tsk - I raised you better than that" look. Cracks me up. In fact lots of her reactions crack me up. We act like fools for her - to distract her from reality ( that's another story ) and she loves it. Sometimes we get "scolded" which makes us laugh harder and sometimes she joins in - even better at it than we are.