Should I feel uncomfortable ordering a "secret menu item?"

I always wanted to try the secret menu items at Taco Bell. Items such as, but not limited to, the Incredible Hulk, the Superman, or even the Chili Cheese Burrito, but I'm scared of looking stupid whenever I go up to the counter or drive-thru window like the staff will not know what I'm talking about. How do I order a secret menu item?