I hit up my local Pizza Hut/Taco Bell and asked the employee behind the counter, "Can you put a taco in a pizza?"... a question that in retrospect sounds kinda creepy, but she was not fazed. She'd clearly been asked this before. "We can't," she replied. "Contamination." I asked what the heck that meant. "Contamination," she repeated. "Who are you -- Dustin Hoffman in the hit movie Outbreak?!!?!", I didn't shout, because I'm respectful and was worried she hadn't seen the film. But that didn't stop me from creating the GREATEST FAST FOOD INNOVATION OF ALL TIME when I got back to my table.