POLL: What is the worst tasting burger e v e r?

A vegetarian burger called "No Bull."

Any vegan burger.

The worst burger I ever had was called a "black & blue" burger.  I don't know what the black was referring to other than maybe it was Black Angus beef, but the blue was referring to the fact it was covered in blue cheese.  I didn't know what it was when I ordered it and it was the only thing I had to eat, and it was like eating someone else's puke.

An overly cooked burnt one