After Quasimodo's death, the bishop of Notre Dame sent word through the streets of Paris that a new bell ringer was needed. After observing several applicants demonstrate their skills, he had decided to call it a day when an armless man approached him and announced that he was there to apply for the bell ringer's job.
The bishop was incredulous. "You have no arms!"
"No matter," said the man, "observe!" He then began striking the bells with his face, producing a beautiful melody on the carillon.
The bishop listened in astonishment, convinced that he had finally found a suitable replacement for Quasimodo.
Suddenly, rushing forward to strike a bell, the armless man tripped and plunged headlong out of the belfry window to his death in the street below. When the bishop reached the street, a crowd had gathered around the fallen figure, drawn by the beautiful music they had heard only moments before. As they silently parted to let the bishop through, one
of them asked, "Bishop, who was this man?"
"I don't know his name, but his face rings a bell."
The following day, despite the sadness that weighed heavily on his heart due to the unfortunate death of the armless campanologist, the bishop continued his interviews for a bell ringer for Notre Dame.
The first man to approach him said, "Your Excellency, I am the brother of the poor armless wretch who fell to his death from this very belfry yesterday. I pray that you honour his life by allowing me to replace him in this duty."
The bishop agreed to give the man an audition, and, as the armless man's brother stooped to pick up a mallet to strike the first bell, he groaned, clutched at his chest and died on the spot.
Two monks, hearing the bishop's cries of grief at this second tragedy, rushed up the stairs to his side. "What has happened?" the first breathlessly asked. "Who is this poor man?"
"I don't know his name, but he's a dead ringer for his brother."
Trust me, I'm a doctor.
Catweasel
Algebraists do it in groups.