Because they always double Czech their work!
A *fabric*ator. It was a slow day at work...
They take so long that some people don't believe they don't work.
The Czech engine light is always on.
You right a Czech.
A: He was looking for a Czech mate.
When you put it in your pocket you double it and when you take it out you find it in creases. -
Look at it in a mirror.