Not quite sure I get what you mean.
Sorry Simon. I learned about the god of the pre-gloat when I was about 13. My dad, brother and I used to take our boat offshore every Saturday and Sunday during the summer to fish for king mackerel. Usually had good luck too, as this was the '70s when there were still fish everywhere.
One Friday, we went to Kmart (I don't remember Walmarts in NC in the '70s) and bought the biggest Igloo cooler they made. It was a big sucker, 4 of 5 feet long, and it made a good extra seat at the back of the boat. King mackerel are a long skinny fish, and we all wanted a cooler that a 30-lb fish could go into and lie flat, for a sensible reason: In a smaller cooler, they took o a curve as rigor mortis set it, and at the end of the day, it was difficult handling and cleaning a fish that was shaped like a big "C",
We put the cooler in the boat, and out we went on Saturday. Fished all day, and had not one strike. Tried again on Sunday, with the same results. Fish all day, not a strike. On the ride in on Sunday, my brother (who was about 10) kept looking at the cooler, very clean and extremely empty. He finally looked up at my dad, and very solemnly intoned "I think that when we bought the cooler, we angered the god of the pre-gloat".
So no gloating before things are a fait accompli. Avoid actions that anger the god of the pre-gloat.