Kids, you gotta love 'em... unless they turn out to be evil.

PHOTOS: Our favorite Disney characters who've appeared on Once Upon a Time

Watch the exclusive sneak peek above of Sunday's Once Upon a Time (8/7c, ABC), in which Charming and Snow (Josh Dallas, Ginnifer Goodwin) try to determine whether their future child, the product of true love, has the potential to be as bad as the Queens of Darkness. The litmus test only requires a unicorn who's lured by a green apple (I thought it was virgins they couldn't resist?).

But why do Charming and Snow see different futures? And would Evil Emma really wear that putrid shade of Pepto Bismol pink? Weigh in with your theories below.

Once Upon a Time airs Sundays at 8/7c on ABC.