My kids and I play this game all the time. (I've even been tempted to try it by myself!
The first person lays on the floor on their back.
The next person lays on the floor on their back with the back of their head on the first persons tummy.
You do this until everyone is on the floor with their head on someones tummy (except the first person, their head is on the floor)
First person says "Ha!" , like a fake laugh.
The next person says "Ha Ha". You go around with everyone adding a "Ha" on their turn.
Before you know it you'll all be in a fit of giggles!!
This game is a great way to cheer the house up when someone ( or everyone ) is having a bad day!!
Just thinking about it makes me laugh!
xoxoxoxoxo
Amee