He wasn't going to call Dean crazy, but that still made Jaime raise an eyebrow. He'd dealt with magic before, foes with god-tier power, and he even had a buddy who'd sold their soul to the devil for superpowers.

That said, "I'll concede that the alien thing is pretty out there. And my first girlfriend was actually a witch. But ghosts sound like a bit of a stretch." Jaime returned the smile with his own, challenging grin, "Don't suppose you have... I dunno, a jar of ectoplasm or something to prove it?"