What makes these cats so cross? People, mostly. And one rabbit who’s really going out of his way to get smacked. Cats will only take so much guff before they let you have it.
It reminds me of my friend who wanted to show off by sticking his tongue out at his iguana. How disappointed he was, when the iguana nipped off the tip of it.
Cats don’t generally remove pieces of you when they get annoyed.