"Oh, right! Tag!" He remembered now - that time he'd played in the city - and with a rather large group, too. He'd liked that. Come to think of it, he should really teach his TARDIS how to play, now that she could. Maybe she would find freeze tag entertaining, too.

"Oh, that's easy," he replied, a boyish grin spreading across his face. "First, you find an alien invasion. Then, you convince them that according to the sacred rules of ancient combat on that particular planet or asteroid or spaceship or whatever, absolute victory will be awarded to the one who wins the deadly and elegant practice of tag. Then, while you have them distracted, you run like hell and make sure to confuse them so thoroughly that the invading forces just give up. Or," he continued, laughing a little at the memory, "if they refuse the challenge, do it anyway. Hello, Priere. Nice to see you again. I'm the Doctor."