I'm the logical one in my furball outfit, and cannot abide when he gets nonsensical if I'm depressed. Like Gandalf the Grey, I "do not suffer fools gladly". Fortunately he leaves me alone until it passes. But what triggers it or makes it worse? A perceived slight, reprimand, or insult from anyone, anytime, anywhere, or a perceived feeling of inadequacy compared to someone else. Or it will just come on spontaneously.