NBA's Steph Curry is 'psycho,' Seth Curry says.

On Thursday night, after the Warriors defeated the Boston Celtics 103-90 at TD Garden to win their fourth league title in eight seasons, their star point guard was named NBA Finals MVP for the first time.

Curry didn't need that confirmation, since he already knew — and his family had witnessed it firsthand.

While Curry is regarded for being a humble and modest figure off the court, his younger brother Seth told Dan Woike of the Los Angeles Times that when he has the ball in his hands, something else totally is churning in his head.

Curry's younger brother, Seth, told Dan Woike of the LA Times that when he gets the ball in his hands, there's something else altogether spinning in his head.

Every time he comes out onto the floor, he knows that no one has ever been better than him on any of the floors he's ever been on."

And it's the reason he's been able to help the Bay Area construct an NBA dynasty.

After the game, he credited his brother Seth with the rally cry on NBA TV.

"He's the first person who asks, 'What are they going to say now?'" Curry remarked.

So, what will they say? What can they say? Curry showed the world his on-court madness on Thursday night, and it resulted in yet another ring.