I think I was pushing myself since it was the last ride before the weekend; I was already tired and I was just pushing myself to get home.
Last night on the way in and this morning on the way home I had several things simply fall off of my bike. Last night I lost a braze-on bolt near the drop-outs for my pannier rack (I fixed that before I left work). On the way home this morning, one of my headlights came off in my hand, one of my taillights was millimeters from getting left in the road somewhere, and the garment bag pannier tried to jump off the rack while I was crossing a busy intersection.
At least I made it home with everything ... except my groceries (which I left in the fridge at work so I can expect that they'll be thrown away before I can get back to pick them up this evening).