never actually had it : Lutefisk it was listed as an topping on the menu for a pizza place in Alexandria Minnesota, anyone from Minnesota, either of the Dakotas or Wisconsin or Scandinavia could tell you how odd it would be on a pizza. for reading on Lutefisk : Lutefisk - Wikipedia, the free encyclopedia
The most extravagant I've gotten with pizza was pineapple, but then again it sounds like you guys have gone to a specialty pizza joint.
Peanut butter and bacon. While bacon on its own is not unusual, when I saw that it was paired with peanut butter I just had to try it. It was actually quite good.
There's no such thing as a "strange pizza topping" ... well, as long as it's food/edible, that is. If people start calling shoe laces a "topping" then fuck me gently, but when it comes to actual food, I can't think of anything that'd really strike me as odd.
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I ordered crab on a pizza once, but the joint was really lazy, so we ended up with some partially shelled crab claws baked into cheese. Orasol gel became a friend.