the feathers/fur/sparks will fly

the feathers fly

There is an argument. When the feathers fly, I'm making myself scarce—there's no way I'm getting roped into a fight between those two. You can be sure that the feathers will fly if the president vetoes the bill that both sides of congress worked so hard to pass.
See also: feather, fly

the fur will fly

there will be serious, perhaps violent, trouble. informal
This phrase originated in the early 19th century, in the US. The image is of a furious fight between dogs or cats.
See also: fly, fur, will

the ˌfeathers/ˌfur/ˌsparks will ˈfly

(informal) there will be anger, annoyance, etc: The fur will really fly when she tells him he can’t go out tonight.
See also: feather, fly, fur, Sparks, will