Jack Bienvenue, an 18-year-old who graduated from Cape Cod Technical High School last weekend, had seen his beloved Boston Celtics climb from the basement of the Easten Conference all the way to fourth place. So when his friends were arguing over who was going to win the title, he didn’t understand what there was to debate. “I said, ‘I’m so confident the Celtics will win it, I’ll get a tattoo of the (2022 banner),” Bienvenue told The Athletic. “My friend said, ‘No you wouldn’t’. So I was like, ‘Screw you guys, I’m getting it done.’”