"Flat-Hatting is a form of flying that
discourages longevity. Originally the term simply meant flying low needlessly. That definition has been expanded to include grandstanding, or showing off — flying foolishly and carelessly. The term itself is said to have arisen from an incident in which the wheel of a low-flying plane struck a pedestrian on the head and crushed a new top hat he was wearing. Besides being grounded for quite a stretch, the pilot had to buy the pedestiran a new hat, costing $12.50, including tax. Hence, the name "Flat-Hatting" — which is probably as good a name as any."
https://www.youtube.com/watch?v=bzIhwXKZdYcNot sure when and where below, but looks to be a P-38 mess.


and what's this stunt? Looks quite fake .... but if it wasn't? .... ugh!
https://www.youtube.com/watch?v=w9x5H4QdpzY