You should make amends when you've done something wrong.
Allan borrows Joe's car and breaks the mirror off putting it in the garage.
Allan wants to avoid trouble with Joe.
Allan gets a new mirror and replaces it, telling Joe what happened.
Allan haphazardly glues the mirror back on so that Joe doesn't notice the damage.
Joe is grateful for Allan's honesty and lets him borrow the car again.
The mirror falls off when Joe is driving, and he almost wrecks.