Make it more interesting

Ash looks at Misty for a moment, and then grins. "You're not gonna beat me twice," she says, looking down at her Gameboy and then back at Misty. "What say we up the stakes."

Misty grins at Ash. "Oooh, interesting, what are you thinking."

Ash pauses for a moment, and then nods at Misty's yellow shirt. "Whoever looses has to spend the next ten minutes without a shirt on."