The very last thing she ever expected to appear in the hallway of the TARDIS was a flipping horse! Granted, if she'd heard the thing coming round the corner, she might have been more prepared--she wouldn't have worn her fuzzy slippers that's for damn sure--but it just appeared out of nowhere! Nothing was ever supposed to do that. (She chose to ignore the fact that she appeared in there suddenly herself ages ago. At least she had an excuse!)

But it didn't take long for Donna to regain control of her mouth, though. "'Atone'?" she asked incredulously. She hadn't quite heard everything that came out of Morgana's mouth; she'd blame the shock. "I'll tell you what you can atone! And what the hell are you doing riding a horse around here for?"