I like to tell non-aviation people of Tex Johnston rolling the Dash80 jetliner prototype in front of the hydroplane crowd.
To show it wasn’t a fluke he turned around and did it again.
Claim is the president of Boeing turned to the president of Bell and asked if he could have one of his heart pills. (Many aviation executives in the crowd that day including potential customers.)
Claimed that the president called Tex on the carpet on Monday and demanded to now what he was doing. ‘Selling airplanes’.
(He did a descending barrel roll to keep positive acceperation on the airframe.)