20 9 year olds () Sorry
There's 20 of them. (More funny out loud)
The get all you '90s references.
Carbon dating.
Launch! Another one from my 9 year old.
I'm bored! (As in board) Another one from my 9 year-old.
I can ride my bike indoors and professor oak can't do anything to stop me.
Catsper.
Only once, and then you are subtracting it from 20.
Tell him you belong to "the" 20%.