A traveling salesman goes into a

A traveling salesman goes into a fairly grungy diner. The waitress comes over, and she doesn't look too great herself.

Deciding not to take any chances, the salesman orders two hamburgers and a hot dog.

The waitress comes over a few minutes later with the hamburgers under her arms.

The salesman says, "Why are the hamburgers under your arms?"

The waitress says, "I'm keeping them warm."

And the salesman says, "Cancel the hot dog."