Due South, Season 1

Ray Vecchio:
Okay, so how do you know the guy who paid Charlie's a fighter?

Benton Fraser:
His wrists. They were completely hairless, indicating he wears gloves that are tied tightly in a constant use.

Ray:
So we're tracking a guy with hairless wrists.

Fraser:
Also, the second knuckle of each hand is slightly lower than the others. His jaw clicked slightly when he spoke, indicating a fractured mandible. And his eyes had shifted downward and laterally in their sockets, cause, no doubt, by repeated blows to the zygomatic arch.

Ray:
Okay, that I'll buy. But how'd you know he worked out in this gym?

Fraser:
It was written on his t-shirt.

Ray:
You couldn't have said that in the first place? You had to go through the hairless wrists and the fractured mandibles?!

Fraser:
I'm sorry, Ray.

Ray:
Aw, man!