Republican presidential candidate John McCain good-naturedly sparred with David Letterman on Tuesday night's "Late Show."

During his monologue, Letterman joked that the Arizona senator reminded him of "the guy at the hardware store who makes the keys" and "the guy who can't stop talking about how well his tomatoes are doing."

After Letterman added that McCain looked like "the guy who points out the spots they missed at the car wash," the senator appeared on stage.

"You think that stuff's pretty funny, don't you?" McCain asked, then added: "Well, you look like a guy whose laptop would be seized by the authorities."

McCain also said the host resembled the guy caught smuggling reptiles in his pants, to which Letterman replied, "Don't knock it if you haven't tried it."