A childhood belief about counting

I thought that if I spent enough time, I could write the biggest number in the world. So I took a piece of chalk and wrote a 1, and then started following it with lots of zeros. (By the way, I was writing on the outside of my house, which didn't make my dad very happy!)

When I had written enough zeros, I proudly showed it to my Dad, who, after calming down from yelling at me about writing on the house, said, "Whatever number you write, I can write a bigger number." I said, "No you can't", and to prove me wrong he took the chalk and drew another zero. Then it dawned on me that there is no largest number!

This led to "infinity" matches with my sister. She would say something involving "infinity", and I would respond with "infinity times infinity" and she would retort with "infinity times infinity plus a googol" and so on ad infinitum!