I've been in a training class at work this week and lunch has been provided. A couple of the days we have ordered out for pizza. There are about a dozen people taking the class and I am the only vegetarian in the group, so we have been ordering 3 "meat" pizzas and 1 veggie pizza. The funny thing is, when the food arrives and people are actually choosing which pizza to eat, the veggie pizza ends up being the most popular. In fact, today when I went to get a second slice, the veggie pizza was already gone.
It's interesting that if you ask people what they want on a pizza they'll usually include some form of meat, but when presented with a choice of pizzas right in front of them, it seems people will frequently opt for a veggie slice.
Of course, this is just a small sample of people, but it is something I've observed in the past with other groups pizza eating habits as well.