Cock up!

Old Van tried hard to get a good job;
Interview outcomes just made him sob!
The saddest tale, as told by his mate,
With great sorrow, I now will relate!
Koos went with, to hold his hand,
Job's up my street...Van felt so grand!
But sad to say, downcast and glum...
Cried dear Van...that was plain dumb!
Koos asked, were the questions too tough?
Van replied no, they were easy enough!
But "show testimonials"...a piece of cake?
That's when I made my biggest mistake!