"I think being a woman is like being Irish." — Iris Murdoch

Work up with a headache, which is unusual, and it took a half hour to figure out what it is.

There is a coffee place near work that I like.  Their coffee tastes great, but after I'd been going every day for a month, I found I was really tense and had a constant headache.  I don't know how I got the idea, but I connected the headache and tension to the caffeine in the coffee.  I believe that the coffee in this place has much more caffeine in it than normal coffee, or even the coffee in nearby coffee shops.

Once I switched, the headache went away.  I happened to go back there yesterday, and boom! the headache's back.