Some years ago I was playing pickup basketball regularly at a local gym. It was pretty competitive; the regulars included high school stars and college players, of which I was neither. I was good enough to run with them, but it was an exclusive group and most weren't so lucky.
One day during the holidays we didn't have enough players; we preferred full court five on five, so we were forced to let some walk-ins run with us. I'll never forget two of the players that ran with us that day because seeing them walk into the gym taught me valuable lessons about first impressions.
Subject 1 was tall and muscular with big hands and long arms; he was an imposing bundle of explosive, fast-twitch athleticism. He was handsome, outgoing, well-spoken, and seemed to have the right mix of confidence and humility. He had all the latest gear; brand new Nike shoes and shorts, an arm sleeve, and a leg sleeve with a padded knee. We assumed right away he'd run with us as a regular rotation guy.
We almost didn't let subject 2 run. He looked like a scruffy pre-teen. At about 5'8' he was average height, but he was skinny and he there was no indication of any latent athleticism. He had severe acne and a poor haircut; busted shoes; and old, dirty gym clothes, all of which is only worth mentioning because of the stark contrast with Subject 1. Furthermore, he was quiet and aloof, though to his credit he seemed focused. We ended up letting him run because we needed ten players.