If your school had that one-in-a-million child, the boy who could fart on demand, then you could play Think of a Number.
Boy who can fart on demand approaches the mark, and says
"Think of a Number!"
You would think of a number, and tell him what it was. For example, "four".
He would then fart loudly and reply "that was five". The fart added one to your number, you see. And when I tried to be clever by saying infinity (which isn't even a number), I simply got the fart and "that was infinity plus one". Touché. Touché turtle's head, sometimes. Touché cloth. Etc.