It is an easy way to have an incredible amount of fun without having to pay for anything, because if you are reading this on any electronic device, odds are that you have a few pillows at home, and the fact that you're reading this means that you're not having an incredible amount of fun right now.
So why not have a pillow fight with a random stranger? It's a pleasant surprise for them and something fun to do for you. What a great win-win! You can even film it and post it on YouTube or something.
Be sure to hand the stranger a pillow before you declare pillow war on them first.
But then be sure to rock out big time.
Here's an example: