"Excuse me, I don't understand what you sayed because I think you look very crazy. Can you tell me better please? Or come see a doctor could be very effective. I'm not joking. "
... Je pense que tu voulais dire :
"Excuse me, I didn't understand what you said. You seem very crazy. Could you say it in a better way, please ? Or go see a doctor, it could be very useful. I'm serious."