A lady calls Santa for repairing door bell. Santa doesn’t turns up for 4 days. Lady calls again, Santa replies: I'm coming daily since 4 days, I press the bell but no one comes out.
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'