At times, especially early in my culinary exploration, I made some dishes that looking back on it now, I think "Well of course that failed!". Chicken fried duck breast without pounding the meat thin equates to a raw interior and bloody, soggy breading.
Similar to npaden, one time I had the bright idea to smoke some turkey legs. I am pretty sure the sharpest teeth in the animal kingdom would not be able to chew that result.
Finally, I tried my first liver dish last year following Hank Shaw's recipe. I do believe that will be the one and only time I ever keep a liver.