I was cutting my brew time down to just a few hours by doing concentrated boils and chilling the kettle in the bath tub. I lost two consecutive batches when the kettles floated and capsized wasting a potential 10 gallons of beer. Expensive beer.
And I was distracted both times.
In a couple of experiments a year ago where I was trying to mash a day in advance, I was sparging into one-gallon water jugs (so I could chill them quickly in the fridge... the theory went, anyway). Yeah, you know what happened each time. Turn my head for a minute... wort all over the floor. Several times. I mean, after the first time, you'd think I would admit this was a bad idea.
I am still going to revisit the mash-ahead idea, but I'll mash into a kettle or bucket and take it from there. My thought is to mash the night before, stop the enzyme activity by cooling the wort with frozen plastic quart bottles, then get up early and brew.
Also, I have found it best to lay out my hop schedule and any other additions in Pyrex cups, labeled with each addition and time, even though I never BUI (brew under the influence). The one time I didn't do this, between one thing and the other I got my additions mixed up.