Three little boys were bragging about how tough they were.
"I'm so tough," said the first boy, "that I can wear out a pair of shoes in a week."
"Well," said the second little boy, "I'm so tough, I can wear out a pair of jeans in a day."
"That's nothing," said the third boy. "When my parents take me to see my grandma and grandpa, I can wear them out in just one hour."