Cost of being towed

If your car is towed, you'll have to pay a tow fee, and if you were parked on a public street, a parking ticket as well.

Receipts

Because receipts are dated and time-stamped, they are useful for maintaining an alibi if you made a purchase at the time of the wrongfully-accused crime.

Sticky plates

When you receive new license plates for your car in the mail make sure that they aren't stuck together appearing as one. Although some states only require the display of one plate on a vehicle, states that require the display of two will fine you for the difference.