Twenty bug bug

We have a big round circle of grass in our apartment. Usually kids ride their bikes, scooters and play there. Today we were spending our afternoon there and after a few rounds of scooter riding Avi and his friends (age range from 3-10 years) sat on the grass to take a break. Avi who loves to make up stories came up with something, 'look there is a twenty bug bug'. There was no bug in sight. All the kids turned and asked, 'what's a twenty bug bug' ? Avi goes, 'its a teeny weeny, insy,winsy kinda bug and its called twenty bug bug. If you look hard enough you can find it". The younger crowd seriously started looking for 'twenty bug bug' and the older crowd started to pretend like there really was a 'twenty bug bug'. They started playing and saying, 'hey look there is a twenty bug bug up your shoulder, hands, head'. Soon, it became a favorite game and they were using terms like twenty car car, twenty pool pool, twenty tree tree, twenty bike bike, twenty grass grass, twenty stick stick. It was catchy and they were laughing hysterically and running around. I have a feeling this bug is going to last pretty long :)