Safety, you think to yourself, settling in for a night on the couch. When out of the blue she runs from the bedroom, panting between clenched teeth, "I'll kill you...", tackles you as you stand up in surprise, sending you both flying backward over the coffee table, banging your head on the television, standing over you growling and kicking, while you make the snap decision whether to fight or flee, to the extent that flight is possible.