Phone and Toothbrush?

Have you ever thought how a toothbrush can work with a phone? An uncle in a bus showed me how...

I was wondering why the uncle was holding a green toothbrush in his hand, no sign that he was going to use it to brush his teeth. He was practically holding it like a pen. I kept on watching him and found out why. He was using the end of the toothbrush to write!

His phone is a touchscreen phone (older version... do you call it touch screen?),where you can write and it will detect the character and show the closest match to the input received. He was writing chinese character and every stroke come down so hard, I can see the middle of the screen are all scratch! Still... I found it interesting...

People nowadays can't live without technology. It's not about not keeping up to date to the news outside, we just afraid that people are going to forget about us if we doesn't show we exist (update facebook status, twitting, texting, etc).