"I don't think I'm the right person to be the judge of Buffy weirdness. There's been a constant weirdness between us since Sunnydale."

Maybe if he hadn't been treating her as some grand Wolfram & Hart illusion specifically designed to fuck with his head, he would've picked up on something a little more weird than their standard brand of weird, but he hadn't. To be honest, Buffy was too busy focusing on how weird he was acting to act too weird around him herself.

"Why, did she try to start something with you?"