Mrs. Davidson's dishwasher quit, so she called a repairman. He couldn't give an evening appointment. Since she had to go to work the next day, she told him: "I'll leave the key under the mat. Fix the dishwasher, leave the bill on the counter, and I'll mail you the check. By the way, don't worry about my Doberman. He won't bother you. But, whatever you do, do NOT under any circumstances talk to my parrot!"
When the repairman arrived at Mrs. Davidson's apartment the next day, he discovered the biggest and meanest looking Doberman he had ever seen. But, just as she had said, the dog just lay there on the carpet, watching the repairman go about his business. However, all the time he was there, the parrot drove him nuts with his incessant yelling, cursing, and name-calling.
Finally the repairman couldn't contain himself any longer and yelled: "Shut up, you stupid ugly bird!"
To which the parrot replied: "Sick him, Spike!"