Two cats met in an alley.
The first cat greeted the other with a mew and exclaimed, “You are looking younger today!”
“Yes,” replied the second cat, “my owners took me along to see their relatives over the weekend, and drove very fast.”
“So, what did it do to your appearance?” The first cat looked puzzled.
”My master who is a physicist says that if you travel very fast, according to Einstein’s theory of relativity, you age less and remain younger,” the second cat mewed proudly.
“Aha!” the first cat exclaimed joyfully at if it had discovered something, “now I understand what my master says.”
“Huh, what does he say?” The eyes of the second cat lit up with excitement.
“He says,” the first cat narrated thoughtfully, “those who drive fast die young.”
At that point a dog barked nearby and both cats ran in opposite directions – very fast.