I saw a guy come into my gym in work boots and jeans. Looked like a construction worker or something. Loaded 315 on the bar and knocked out 8 reps with no warmup. Then did 405 for 8 reps. Then did 455 for 5 reps. No spotter, no signs of struggle. After that, he quietly put the weights back, got a drink from the fountain, then left. Back to his work truck. It was lunchtime.