We visited my family on a Friday about 20 years ago when we lived 150 kms away and had a tune up done
by them.
It was the worst we've ever had as on the way home the car started to cough and splutter when we
got about 100 kms from home.
Got out and pulled up the bonnet and there were sparks going everywhere,(there were three cracked
spark plugs).
I always ask that I get the old ones back when they finish and mark them with a texta before we get the
work done,(which was just as well as I had to change those three so we could get back home).
We always carried a toolbox in the back of the car.
Rang them on Monday and they said that it happens sometimes and they would replace the three plugs
when we were next in town,(they claimed no knowledge of that when we did get back there).
In reality the plugs would've cracked because they stuffed them.
So we told our families and friends and none of us have ever used them since,
Anyone that's ever asked if they were any good was told the same story.
As for the add,(it makes me think of that could've been us as we had to cross railway lines to get home).
Oh lordy! Now we've got the get into rubber one going as well 
