I got home last night to discover that my firewall had gone on the fritz. It was too late in the evening to try fixing it, so I went to bed.
Up this morning and out to work, through what turned out to be 45 minutes of traffic jam for no discernible reason. Spent all day beating my head on an intractable problem, and didn't solve it. Went home via Sainsbury's, which was in utter chaos because its car park was full of bulldozers; also discovered on the way home that my iPod had quietly stopped working (it now refuses even to turn on).
I've now managed to emergency-