"Come on, Marty, choose a bike! What do you think of this red one?"
"It's really cool, but it doesn't have training wheels. You know, the ones that help me not to fall."
"Then here's this blue one, it has them."
"Great, then that one will be good."
"Oooor... you could try the red one anyway, maybe you can ride without training wheels."
"Oh, which one should I choose?"