[from
here]
There wasn't anyone on the stairs, which was good, cuz curiosity had gotten to Donna and she didn't want to end up embarrassing either herself of the alien she was traveling with - if his species got embarrassed. "So hey," she started, looking back as she took the first step onto the stairs, "The place you're from, what's it called? I might not look it, but I've been to a few places other than Earth before. Maybe I've stopped off at your planet without even knowing it."
Wouldn't that be a surprise if she had?