"It's weird, right?" Priestly asked, patting Piper reassuringly on the shoulder. "I know, it's totally weird. I, for instance, apparently have not one but two doppelgangers who used to go to our school. I only ever really heard about Alec, but Dean was an okay guy. Still. Super weird."

Especially when he spent a weekend as Dean's alternate personality, but that wasn't the sort of thing he could bring up in mixed company.