Slippery Slope Arguments in History: David Hume
Camel (A) sticks his nose under the tent (B), which collapses, driving the thin end of the wedge (C) to cause monkey to open floodgates (D), letting water flow down the slippery slope (E) to irrigate acorn (F) which grows into oak (G). [Illustration by Eric Kim, from my idea.]
From Hume's Of the Liberty of the Press (1742):
It is seldom that liberty of any kind is lost all at once. Slavery has so frightful an aspect to men accustomed to freedom that it must steal in upon them by degrees and must disguise itself in a thousand shapes in order to be received.