Many things, both niche and mundane, can be split into the categories of either Jewish or goyish. It's a fairly easy trope once you start reading the way things are divided. For example:
Brown mustard - Jewish
Yellow mustard - goyish
Lox and schmear - Jewish
Tuna melt - goyish
Matzo ball soup - Jewish
Chicken noodle soup - goyish
Apples with honey - Jewish
Apples with fondue - goyish
Target - Jewish
Walmart - goyish
Michael's Arts and Crafts - Jewish
Hobby Lobby - goyish
Air Force - Jewish
Marines - goyish
Miami - Jewish
Myrtle Beach - goyish
Massachusetts - Jewish
Maine - goyish
Germany - Jewish (ironically)
Poland - goyish
Blue, white, black, gray - Jewish
Red, green, yellow, brown, pink - goyish
Being a mensch - Jewish
Being a stand up guy - goyish
Get the idea?
Any other examples you guys here, either Jews or goyim, can think up?