WTF Moment

Today I went for driving test, failed on the road but passed the rest, so I only need to retake on the road test. It's because of my fault and the tester's fault. After the test I figured out that I would have fail the test even if the tester were not at fault, so I didn't argue.

On the road test is just like a ride on the roller coaster, where the player take a frightening ride and then come back safely, where some may not. Anyway, while waiting for the on the road test, I figure out some ridiculous phenomenon, where all with reasonable explanation except for 1.

LMAO Level
The candidate and the tester swap place when returning back from their test. Swap place after a roller coaster ride huh?! How frightening!!
Explanation: This is just easy, the candidate is so suck at driving that the tester have to get rid of him as soon as possible. Haha.

WTH Level
The candidate is missing when the car return from the test. It's like somebody went missing after a roller coaster ride.
Explanation: This is only my hypothesis, the candidate fail the test and ask to leave the car along the road. Otherwise, I can't think of any other way that does not involve crime.

WTF Level
The tester is missing when the car return from the test. It's like the driver of the roller coaster missing after the finishing the ride, if roller coaster have a driver.
I have no fucking idea how this happen.

For those who haven't take their driving test, enjoy yourself.
For those who took their driving test, explain the WTF level to me please. I feel like going mad. LOL