What do roots have to do with travel(l)ing salespersons? Oh, wait, I think I've got it.

I heard that joke about a giant panda. It dines in a restaurant, and when the waiter brings the bill, the panda draws a gun, shoots him, and walks out. The manager catches up to the panda in the street. "You can't do that!"

The panda takes out a dictionary and shows the manager the entry. "Panda (n). A bearlike mammal native to western China. Eats shoots and leaves."