It is proof that there was more work charged for than a cat install. Dustin's post clearly explains what the extra work was.
Although it's already too late for you to avoid looking stupid, you should probably stop while you're behind before you become even more of a laughing stock.
Petz #2
"What's the point of having the car if you don't drive it?" - Mrs. Guapo 08/20/05
Jeeeesus Christ - my Dad (after a ride in my Z) 12/26/04
People have the right to freedom of expression. However, people also have the right to point and laugh- aliaZ 04/06/06