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'
Santa: I have swallowed a key. Doctor: When? Santa: 3 months back! Doctor: What were you doing till now? Santa: I was using duplicate key, now I have lost it too.