"This isn't funny Buffy!"
"I'm sorry, but it's just such a Xander thing to do: you try to order take-out, but instead dial the wrong number and get a goddess instead. She offers you one wish, which you use to ask her to stay with you forever as your girlfriend. So now every time it looks like the two of you are going to be separated, this 'Ultimate power' will step in to keep you together."
"That's about it."
"How did you ever survive living on the Hellmouth?"
"Having a best friend who's a Vampire Slayer? So I'm a slow learner, ok."
"What's her name anyway?"