I think we all know KG is a little off, but some of these stories provided Bleacher Report (there is a Part 1 and Part 2) are legendary.
Here are just a fews, I encourage you to read them all at Bleacher Report.
Paul Pierce: One time, he asked [Joakim] Noah if he could rub through his hair, like a female or something.…And I know that kind of made [Noah] hot. And this was when Noah was a rookie, too. I remember Noah looked up to KG. He was like, ‘Man, KG, I had your poster on my wall, I looked up to you, man.’ And then [Garnett] just said something like that, and was like ‘F— you, Noah.’ I was like, ‘Whoa.’ This kid fresh out of college, looks up to KG, just said he had his poster on the wall, and he tells him that! It crushed him. It crushed Noah.
Brian Scalabrine, Celtics forward, 2005-10: Over the course of 82 games, or 110-some games like we played, a lot of guys can get real loose. He never allowed that. One day Leon Powe and I were cracking up on Eddie House’s tattoo. … [Garnett] was like, “C’mon, Scal, it’s time to rock! What the ‘F’ are you doing?” And I was like, “You know what? You’re right. It is time to rock.” We’re about to play the Dallas Mavericks and we’re over here messing around. It was 55 (minutes) on the clock or something like that. He was locked in and focused. That’s how it is with him. If you want to be on the team, that’s how it is going to be.
Paul Pierce: It probably made some guys uncomfortable, maybe [some felt he] need[ed] to tone it down. But I’m like, “No, that’s Kevin. Y’all tell him to tone it down like it’s a weakness, but that’s his strength. He’s gotta be like this. He’s getting ready.”
Kendrick Perkins, Celtics teammate, 2007-11: Before the jump ball, he goes to the sections of the fans and is like [pounding his chest several times], “Motherf—–s!” He’ll say a whole lot of [stuff]. And the fans just go crazy. And then he started getting cheers and, and you feed off that, right?
Doc Rivers: Before Game 6 in the (2008) Finals when we beat the Lakers, I walked in the locker room, and Kevin gets [hyped] up to where sometimes he goes over the line. You could see it. I had him come in my office and sit. He’s sitting there five, 10, 15 minutes. I don’t say a word. I just go back to work. He’s moving around and finally he says, “I’m in a timeout. I’m in timeout.” I didn’t even respond. You could hear him: “Phew” (exhaling). But you think about a guy who has been in the league that long and is still that jacked up for a game that you literally have to calm him down. That’s my favorite story.
Tyronn Lue: A lot of people do all their howling on the court and they’re faking just for attention, but what he does is genuine. So one day we were at his house and we were watching Puff Daddy’s show Making the Band, and in one of the scenes, some new guys came in and were trying to sing and were trying to compete against the guys who had been there. And KG just got so hyped, “Motherf—-r, you’ve got to stand up for yours! You’ve got to fight! Motherf—-r, you’ve got to come together!” He’s going crazy, he’s sweaty. And he just head butts the wall and put a hole in the wall of his house.
Just some great stuff here.