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"A colander, Slayer? Really?"
"What? You don't like my technique?"
"No, actually, I was thinking of making a Caesar salad for lunch and now I'll have to wash the blood off first."
"Wash the blood...? Okay, who killed vampire Spike and put a human doppelganger in his place? Ooh, it's like that time with Willow except in reverse!"
"You think I'm not real, eh? I'll show you who's real!"
"And just how do you expect to-- aah! Oh! Mmmm!"
...
"So, am I real?"
"Mmm, dunno. You could still be a fake Spike. I'll have to do some more checking..."