Holiday cheer: Linda's rum balls

These were (and perhaps still are) standard fare at UVA religious studies department holiday parties during our former secretary Linda's tenure. Rumored to light with a match, although Linda says they don't. That might require more rum.

1 cup crushed vanilla wafers
1 cup powdered sugar
1/2 cup nuts
2 tablespoons to 1/4 cup flour
2 tablespoons corn syrup
1/4 cup rum
2 tablespoons cocoa

Mix the ingredients. Roll them into balls and then in sugar.