Good Old Times

The other day I remembered a prank that my grandparents and I used to play on my aunt and uncle and their two kids when I was about eight years old:
My cousins and their parents lived approximately hundred kilometers from my grandparent's place. When we visited them, my grandpa used to park the car around the corner. I would walk the rest of the way, ring the doorbell and pretend that I had come all the way on my feet. A minute or so later my grandparents would come driving around the corner saying something like "This time we really hurried, he cannot possible be here before us."
In hindsight it's pretty obvious that nobody fell for it (except maybe for my cousins, who are younger than me), but they all did a great job pretending to believe what an amazingly good jogger I was...