Based on the idea that laughter is good for you, we started off with fake laughing; soon enough it was very real!
Then we conducted a group experiment; one person lying on the floor with another person's head on their tummy, they fake laughed. It was very contagious and even those not involved were laughing at those who were on the floor!
Your brain releases endorphins, (feel-good hormones), when you laugh, but it doesn't know the difference between real and pretend laughing, so you benefit either way.
Look at the fun we had. Give it a go yourselves at home, it's fun!