When irritation is anxiety wearing an angrier outfit. First, an apology to every perfectly lovely Karen and Brenda reading this. We're not talking about you. Here, “Karen” and “Brenda” are affectionate shorthand for those people—or those internal voices—who seem uniquely gifted at pressing our buttons. Karen sends the unnecessary “Just following up…” email at 7.03 am. Brenda offers unsolicited advice about how you should live your life. And somehow, a perfectly ordinary Tuesd