2006. O'Hare. I'm close to the front when exiting a UK > US plane. The 'agent' sees an implant (self-done years prior) in the back of my right hand. Calls it 'brutal'. I was directed to sit in a chair until way after the whole flight had disembarked. I was then questioned about my luggage, reasons for visiting.
Some years later "Pull the guy with tattoos". Full search.
Year or two after that, New York, pulled from the queue, directed to stand in a clear box. "Do not move your feet from those markings". My young daughter had to stand and watch.
Another trip. My passport photo did not fit their criteria. "Why did you shave your head?" .. "Because it was hot" .. repeat that whole interaction several times.
I am so so happy that I never have to visit the USA again and it's solely because of the 'people' assigned as 'guards'.