I tear out my hair, scream "It's garbage! Garbage!", and head off to the local pub to get tanked up on absinthe.
But
When I don't burn the custom then run it over with the car, I usually keep it intact if it's a "character" custom. A character custom is a custom that in some way impresses me as having a personality / intellectual investment. If it is just a generic custom with a hair swap or a virtually random body part swap, I don't give it any special recognition and treat it like any other klickie.