The ad in the local newspaper read: "Purebred Police Dog $25." Thinking that to be a great bargain, a woman called, and bought the dog, sight unseen and asked if the dog could be delivered.
The next day a van pulled up and left her the scruffiest, mangiest, looking mongrel she had ever seen. In a rage, she telephoned the man who had placed the ad. "What do you mean by calling that mangy mutt a purebred police dog?"
"Oh, don't be deceived by his looks, Ma'am," the man replied. "he's undercover."