"The Plumber Has Arrived" joke

A lady was expecting the plumber; he was supposed to come at ten o’clock. Ten o’clock came and went; no plumber; eleven o’clock, twelve o’clock, one o’clock; no plumber.
She concluded he wasn’t coming, and went out to do some errands. While she was out, the plumber arrived.
He knocked on the door; the lady’s parrot, who was at home in a cage by the door, said, “Who is it? ”
He replied, “It’s the plumber. ”
He thought it was the lady who’d said, “Who is it? ” and waited for her to come and let him in. When this didn’t happen he knocked again, and again the parrot said, “Who is it? ”
He said, “It’s the plumber! ”
He waited, and again the lady didn’t come to let him in. He knocked again, and again the parrot said, “Who is it? ”
He said, “It’s the plumber!!!!!!!! ”
Again he waited; again she didn’t come; again he knocked; again the parrot said, “Who is it? ”; “Aarrrrrrgggggghhhhhhh!!! ” he said, flying into a rage; he pushed the door in and ripped it off its hinges. He suffered a heart attack and he fell dead in the doorway.
The lady came home from her errands, only to see the door ripped off its hinges and a corpse lying in the doorway, “A dead body! ” she exclaimed, “Who is it?! ”
The parrot said, “It’s the plumber. ”