“switch (ref $@) { OverflowError => warn 'Dam needs to be drained'; DomainError => warn 'King needs to be trained'; NuclearWarError => die; }”

Source: The Anarchist Cookbook (1971), Chapter Three: "Natural, Nonlethal, and Lethal Weapons", p. 92.

Robert Harris, "The Making of Neil Kinnock" (Faber and Faber, 1984), page 208.
Speech in Bridgend, Glamorgan, on Tuesday 7 June 1983. Thursday 9 June 1983 was polling day in the general election.
Context: If Margaret Thatcher is re-elected as prime minister on Thursday, I warn you. I warn you that you will have pain – when healing and relief depend upon payment. I warn you that you will have ignorance – when talents are untended and wits are wasted, when learning is a privilege and not a right. I warn you that you will have poverty – when pensions slip and benefits are whittled away by a government that won’t pay in an economy that can't pay. I warn you that you will be cold – when fuel charges are used as a tax system that the rich don't notice and the poor can't afford.I warn you that you must not expect work – when many cannot spend, more will not be able to earn. When they don't earn, they don't spend. When they don't spend, work dies. I warn you not to go into the streets alone after dark or into the streets in large crowds of protest in the light. I warn you that you will be quiet – when the curfew of fear and the gibbet of unemployment make you obedient. I warn you that you will have defence of a sort – with a risk and at a price that passes all understanding. I warn you that you will be home-bound – when fares and transport bills kill leisure and lock you up. I warn you that you will borrow less – when credit, loans, mortgages and easy payments are refused to people on your melting income.If Margaret Thatcher wins on Thursday, I warn you not to be ordinary. I warn you not to be young. I warn you not to fall ill. And I warn you not to grow old.

2000s

WTF Is…? series, Day One: Garry's Incident (October 1, 2013)

Source: Charmed Life

Source: Lawe's Justice

On pardoning Nixon, in A Time to Heal (1979)
1970s

1930s, Address at the Democratic State Convention, Syracuse, New York (1936)
Context: Let me warn you, and let me warn the nation, against the smooth evasion that says: "Of course we believe these things. We believe in social security. We believe in work for the unemployed. We believe in saving homes. Cross our hearts and hope to die! We believe in all these things. But we do not like the way that the present administration is doing them. Just turn them over to us. We will do all of them, we will do more of them, we will do them better and, most important of all, the doing of them will not cost anybody anything!"

1940s, To Every Briton (1940)
Context: This war has descended upon mankind as a curse and a warning. It is a curse inasmuch as it is brutalizing man on a scale hitherto unknown. All distinctions between combatants and noncombatants have been abolished. No one and nothing is to be spared. Lying has been reduced to an art. Britain was to defend small nationalities. One by one they have vanished, at least for the time being. It is also a warning. It is a warning that, if nobody reads the writing on the wall, man will be reduced to the state of the beast, whom he is shaming by his manners. I read the writing when the hostilities broke out. But I had not the courage to say the word. God has given me the courage to say it before it is too late.