Now there's a name that'll get Cal's attention and take his mind entirely off his woes.

"Time travel, huh? I thought so." Swallow of coffee. "You know, two other people have mistaken me for Jack Harkness since you did? And they work for him, they see him every day. He must be like my long-lost twin or something if even people who spend a lot of time around him think I'm him. Too bad he can't come in anymore, I would've liked to meet him."