Sporty

A blue Chevy Malibu says HOCKY. I wonder how many variations of that are driving around Michigan?

The Secret

This person probably knows the DVD by heart: AFFIRM on a Dodge Grand Caravan

Inspiring

CRE8IT on a black Pontiac G6

Catchy

On a silver Stratus: MYCARMA

Procrastinator

This is equivalent to "the check's in the mail," in my opinion: WILBDUN on a white Accord.

Bad to the Bone

On a blue Audi: 1BADTT

Short 250

Thank you, gas-hoggish Ford 350 for cutting me off this morning. Otherwise, I might not have seen that your plate belongs on a different vehicle: FORD100.