英语笑话:The seat you've taken is mine

"Excuse me, but the seat you've taken is mine."
 
"Yours? Can you prove it?"
 
"Yes, I put a cup of ice cream on it."
 
"请原谅，你占了我的位置."
 
"你的位置？你能征明这点吗？"
 
"能，我在位置上放了杯冰激凌."