I think I'm going to heave. I just found this site which has, among others, receipes for

• Mashed Potato Chocolate Cake
• Chocolate Mayonnaise Cake
• Chocolate Sauerkraut Cake
• Tomato Soup Chocolate Cake
• Zucchini Chocolate Cake

which actually contain the ingredient that gives them their respective name. Urgh.

Some things should never, ever be mixed, especially not when the result is supposed to be a cake.