Okay, this is simple. Go here, enter something in, set translations to max, and see how bad of a continual mistranslation you can get.

Here's mine:

Original text:

"Hello world! This is a test to see how well this works. Or rather, how well it doesn't work."

...35 translations later, Bing gives us:

"How to find a job in this world sound test. During the period of work"