I did when stationed at Ft. Knox in 1986. He rode up onstage on a Harley he clearly didn’t know how to handle. I mentioned it later to one of my Sergeants, who replied, “it’s a prop, he’a trying to sell something he ain’t. He’s fake.” Wisdom across the years...
Yeah, it’s hard to fake handling a serious street bike at low speeds, when dismounting, deploying the stand (kick or center). It’s something that takes some experience.