The worst pizza I ever had was at a Datageeks meetup in Munich (absolutely great meetup, by the way; generally over-booked). It was covered in some kind of microwaved, poached chicken, drowned in gloopy curry-sauce-from a tube. I felt so sick and ashamed after the third slice.
At least for me, pizza is one of those foods that I really like when it's good. Personally I tend toward brick oven thin-crust but, in any case, pretty fresh out of the oven, non-soggy, fresh and flavorful ingredients. Unfortunately most pizza, and especially most "event" pizza is none of those things and it's disgusting.