I have a friend who does this just so nobody ever asks for any of his pizza because mushroom is only enjoyed by mongoloids and middle-aged people.
I'm only 23 and mushrooms are a standard choice for me
Mushrooms, pepperoni, onions and peppers. Chorizo if they do it.
Lots of mozzarella, semi-dried halved cherry tomatoes with garlic and basil, onions, rocket and some good prosciutto
YUMYUMYUMYUMYUMYUMYUMYUM.