One day, Jack met the doctor because he swallowed the coin last week.
Doctor: Why you come to see me today not last week?
Jack : Because I wasn't feel the pain last week.
Doctor: How about today? Are you sick?
Jack : No.
Doctor: I know you want me to take out the coin from your body.
Jack : Yes, I want to use the coin today.
Hahaha.............GOOD LUCK IN YOUR EXAM. DON'T STRESS!