Banta Singh finished his English exam and came out. His friends asked him how he had fared. He replied, "Exam was okay, except for the past tense of 'think'. I thought, thought, thought and at last, I wrote 'thunk'
Son: Dad did you have a love marriage with mom? Santa: Yes son. How do you know? Son: Coz of the difference of 4 months between your marriage and my date of birth.