If Arthur could roll his eyes any harder, they'd be staring at the back of his skull. He orders another beer when Eames does (not a draught this time), and then leans forward onto the bar.

"I'm just telling you - humans walk into those things and more often than not, bad things have happened to them. If you don't want the Night Council interfering, you should do a better job of keeping to yourselves."

It's the beer talking. Well, it's Arthur talking, but the beer is certainly loosening his mouth.