No, serious business.
They make sure that the parts are new, or you can prove you purchased them legally. If not, you could strip two cars, apply for a new VIN number and wa-la you have a car.
The troopers are mostly good-natured when you are there. Last time I did this, the tallest Trooper came up to me and said:
Trooper: Your car looks fast, how fast can it go?
Me: I don't know, I haven't been able to drive it.
Trooper: I tell you what, drive it down to the end of the service road here, and drive back as fast as you can, and I will radar you and tell you how fast you were going.
Me: (seems wrong.....)
Me: Nooooo, you'd give me a ticket!
All Troopers: Belly laughs!
Their report goes to Jeff City, and then Jeff City makes a VIN tag for the car and sends the VIN tag back to the Troopers. Then I go back to the Troopers and together we attach the VIN tag to the car, and they then stamp the rivits with a special stamp.
E
) and go for a cruise. 
