How do I stop parakeet from biting game?

I got Boniface when he was a baby a year ago, and he was a solo birdie until we got him a wife about six months ago...so he's always had a strong attachment to humans. He loves to come out of his cage and play with the family, and even shows more interest in humans than his wife when he is out and about. But he's made up this game he seems to love where he runs around on the floor and bites every toe he sees. He'll bite really hard, then run away, then run back and bite again, and if you don't chase him he'll just keep doing it until you do. It's so painful and annoying, is there any way to stop this? He's a wild man! PS. He's not AFRAID of us and isn't trying to PROTECT himself or his wife, he is incredibly tame and even comes to you when you call his name. He only bites toes and I don't know why