I came across a funny blog today called thinkingthelions.com. Today the writer posed the question of whether the word pumpernickel is related to the word pumpkin.
Thus I felt compelled to exert my Google-Fu skills, and Googled
"pumpernickel etymology"
By which I discovered that Pumpernickel bread is named after the German for "makes you fart like the devil."
"Etymology: German, from pumpern to break wind + Nickel goblin; from its reputed indigestibility."
Which just goes to show you that you can't make up stuff as weird as the truth.