I know that one well!
I thought I had messed up yesterday's loaf of sourdough (yeasted for the breadmaker) big time. It's a packet mix that you add yeast (provided) and water to. I started off following the directions (when I bought the box of 4 loaf packets) 1 packet, 420 ml of water and 1½ tsp of yeast (4.5g). 2nd attempt was 3g of yeast and this 3rd attempt was 2.5g of yeast. But crucially this last time the water was really hot. not warm, but hot! But it was 6am in morning after a long day and a bad night and I wasn't thinking straight when I put it on. As I had to go out because the knee scooter I had on hire for hubby had broken, I just put it on and set it going with out thinking. I should have delayed the start but didn't, so when I go have to see it hadn't risen much at all and wasn't level with the top of the loaf tin (1.5kg loaf tin!) I thought it was going to be a huge failure. Hubby cut into it and tried it, announcing that it was the best loaf yet! what did I do? Can I repeat it? Errr... No! I have no idea what temperature that 420g of hot water was at other than below 100°C and maybe above 50-60°C!