the Nazis arrested the Communists,
I said nothing; after all, I was not a Communist.
When they locked up the Social Democrats,
I said nothing; after all, I was not a Social Democrat.
When they arrested the trade unionists,
I said nothing; after all, I was not a trade unionist.
When they arrested me, there was no longer anyone who could protest.
Martin Niemöller 1892-1984
A funny one:
The following sentence is true:
The previous sentence is false!
Is your job plagued by the evil
demons of stupidity?
Out! Out! You demons of Stupidity!
From The cartoon Dilbert - by Scott Adams
And here is a link to The Dilbert Zone for more