I live in WI.
Cheese curds, battered, crusted, deep fried. String cheese wrapped in a won ton wrapper and then fried is related. And not the awful processed cheese crap you get in the freezer at Walmart. Local cheese(WI) where the curds are from this morning and still squeak, and local string cheese. Smoked string cheese is also good.
Beer cheese dip with assorted things to dip into it. Anything from tortilla chips to deep fried bread dough balls coated in garlic butter/herbs.
Breaded and fried mushrooms. Button mushrooms are passable(amateur hour) thin sliced portabella caps breaded and fried to dip like french fries are better. (buttermilk ranch dip)
Serve with beer.
In a non-pub/bar/eatery setting, like a party, sliced cheese and local smoked sausage. Like summer sausage, but it isn't. Venison is common, usually mixed with beef, maybe some pork, smoked hanging dry in natural casing. Cut in thin slices and serve. With beer.
OK, now that those "lightweight" common items are out of the way, I will divulge the best, likely most heart condition inducing appetizer.
Jalepeno poppers. No no, not how you are thinking.
Take a large jalepeno(local grown) cut in half, scrape out insides.
Fill with a blend of cream cheese and finely shredded sharp cheddar. Using 100% cream cheese is amateur hour.
Place a strip of pan fried venison "back strip" across the top of the filled pepper. (make sure to lightly season the meat) I guess a bit of beef tenderloin would serve if you have to.
Wrap with a thick strip of local made applewood smoked bacon.
Bake in oven until bacon is done on a foil lined cookie sheet. You don't need the foil but the boss of the house will have something to say about cleaning the pan after if you don't.
Serve with beer.
I am sorry this got long, but around here appetizer is one of the food groups, and it comes down to more of appetizer categories within the whole then just appetizers, if that makes sense. Out of towners think it is weird to see the appetizers on a menu with pricing in close proximity to actual meal items, until they see the quantity and method/time used to prepare. Some places the menu appetizers are made to be a meal if you would like, or could be shared with another and still have more then enough. Home of the supper club means we know how to and like to eat and appetizers have been part of the tradition and escalated in complexity for some time. Things like "pulled pork nachos" for instance.