You know the fat lady is about to sing when a dictator unleashes hell from above over his own unarmed, civilian compatriots, and bombs parts of his capital city. That's a bridge too far even by the unspeakable standards of Western-backed dictators in the Arab world.
You know the (ghastly) show may be over when Sheikh Yousef al-Qaradawi, one of the most popular Sunni authorities in the world, not least because of his weekly show on al-Jazeera, issues a fatwa - "I am issuing a fatwa now to kill [Muammar] Gaddafi. To any soldier, to any man who can pull the trigger and kill this man to do so" - and then prays live, on al-Jazeera, for the end of the Libyan dictator ("O Lord save the Libyans from this pharaoh." When he finishes, the al-Jazeera anchor says "Amen").
You know the bells are ringing when your "Abu Omar Brigade", responsible for your protection, is still on a rampage; but your ambassadors around the world defect en masse; your own deputy ambassador to the United Nations, Ibrahim Omar al-Dabashi, says your government is carrying out genocide; your fighter pilots refuse to bomb your cities; your military officers, in a statement, ask all members of the army to head to Tripoli and depose you; a coalition of Islamic leaders tells all Muslims it is their duty to rebel against you because of your "bloody crimes against humanity"; and to top it off, people are calling for a "million man march" following the Egyptian model.
And what about the Maltese Falcons? In a day of volcanic activity, it's hard to beat the spectacular defection of two colonels of the Libyan Air Force, who flew their Mirages to Malta. They had refused to bomb protesters in Benghazi, telling Maltese authorities they had come so close to carrying out their mission that they could see the crowds on the ground. They also passed "classified" information about what the Libyan military has been up to.
And all this in just one day - Monday.
It was not enough to deploy "black African" mercenaries in a shoot-to-kill rampage in Benghazi. Already on Sunday, Sheikh Faraj al-Zuway, leader of the crucial al-Zuwayya tribe in eastern Libya, had threatened to cut oil exports to the West within 24 hours unless what he called the "oppression of protesters" in Benghazi was stopped.
Akram Al-Warfalli, a leader of the al-Warfalla tribe, one of Libya's biggest, in the south of Tripoli, had told al-Jazeera Gaddafi is "no longer a brother, we tell you to leave the country". The 500,000-strong Berber, Tuaregs from the southern desert, are also against him. When you have four of your key tribes - the spine of your system - marching on Tripoli to get rid of you, you better watch out.
History may eventually register how Gaddafi's appalling 41-year rule in Libya (he was already in power when "Tricky Dicky" Richard Nixon was the United States president) virtually collapsed in only 24 hours. There will be blood - a lot of blood; but "brother" is about to go down.