Overheard in line at Borders

It was pouring down rain and a grandfather said to his 8 or 9 year old grandson:

“Wow, look at that rain. Too bad we didn’t bring an umbrella. But then, if we had an umbrella, we probably wouldn’t need it. Do you believe we can control the weather by carrying an umbrella?”

Grandson, rather dubiously responded:

“Well… we could control how wet we got.”

PS: If you’re wondering, I bought this and this.