Okay, all the talk of ketchup reminded me of one of my non-habits. I am repulsed by ketchup. I love tomato-based anything, adore raw tomatoes...but ketchup makes me gag and it always has. I had a prof who had worked in a ketchup bottling plant in her younger years, and her stories sealed the deal for me.
I do realize that I would probably avoid any canned or bottled food if I spent one day in a bottling plant, but since I despised ketchup anyway, the images she spun for us has only made me avoid ketchup even more.