By the way, I hate those flir brainteasers! I don’t think I have gotten a single one right.
At least we all knew what this was when we looked at it, a house! 
Very often as we interpret thermal imaging scans we have to be able to describe what we see is happening rather than what it is we are looking at.
Anomalies don’t come with an identification tag attached to them. Some look like air infiltration, some look like thermal bridging, some look like water damage etc. and we should not be so quick with the answer and not focus on the entire situation.
Wayne was looking at the gutters and the electrical meter can while most of us focus on the big blue triangle.
As for the wall with the triangle, there are three things going on at the same time. They are overlapping one another and making things even more complicated. We have two warm corners, a big blue square and an overlapping triangular pattern. There are three things happening and we must identify all three before we can accurately interpret the scan.
Dan (bieng a smart ***) was more correct than he realized!
The big-box theory is exactly what the OSB is doing (changing the thermal transfer rate) and his peeing dog came from the clouds!