I worked with my dad all through high school in the meat department and I have to say there were certain things that gave me the heebie-jeebies.
Have you ever seen a 5 gal pale of raw rocky mountain oysters? I couldn't stomach beef tongue or brains.
Another thing that grossed people out was tiger meat, he made it for the local bars on Saturday morning, I don't remember everything he added but he used raw lean beef (no fat what so ever), onions, celery, pepper, garlic/salt, run it though the grinder three times. Served cold with crackers. It got a bad rap because people were trying to make it at home using ground beef with fat.