I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. After much trying, you might be able to remove the third one also, but it remains. It dies hard!

Why this works

This riddle plays with the word "habit" and its letters in a clever way. When you remove the first letter 'h', you're left with "abit," which sounds like "a bit." Then, when you take away the second letter 'a', you're left with "bit." Finally, if you remove the third letter 'b', you're left with "it," which is still a valid word. The phrase "it dies hard" refers to how habits can be difficult to break, tying the entire riddle together with its theme of persistence.