Riddle: I have one, you have one. Take away a letter and a bit remains. If you remove the second, bit still remains. After much trying, you might be able to remove the first one also, but it remains. What's the word?
Answer: Habit! Remove the 'H', and it's 'a bit'. Remove the 'A', and it's 'bit'. Remove 'B', and it's 'it'.