Ecclesiastes 7:6

For as the crackling of thorns under a pot, so [is] the laughter of the fool: this also [is] vanity.

Ver. 6. For as the crackling of thorns under a pot.] Much noise, little fire; much light, little heat. So here is much mirth, little cause; a blaze it may yield, but is suddenly extinct; this blaze is also under a pot; the gallantry of it is checked with troubles and terrors; it is insincere many times; it is but the "hypocrisy of mirth," as one calls it. It is truly and trimly here compared to a handful of brushwood, or sear thorn, under the pot. Ecquando vidisti flammam stipula exortam, claro strepitu, largo fulgore, cito incremento, sed enim materia levi, caduco incendio, nullis reliquiis, saith Apuleius - a very dainty description of carnal joy, and agreeable to this text. And herewith also very well suits that of the Psalmist, "Before your pots can feel the thorns, he shall take them away with a whirlwind, both living, and in his wrath." Psa 58:9 Fools themselves are but thorns twisted and folded together; Nah 1:10 "briars"; Mic 7:4 "brambles." Jdg 9:14 Their laughter is also fitly compared to thorns, because it chokes good motions, scratcheth the conscience, harbours the vermin of base and baggage lusts. And as themselves, like thorns, shall be thrust away and utterly burnt with fire in the same place, 2Sa 23:6-7 so their joy soon expireth, and proves to be rather desolation than consolation - as lightning is followed with rending and roaring, as comets outblaze the very stars, but when their exhaled matter is wasted, they vanish and fill the air with pestilent vapours. The prophet Amos telleth the wicked that "their sun shall go down at noonday." Amo 8:9 Surely as metals are then nearest melting when they shine brightest in the fire, and as the fishes swim merrily down the silver streams of Jordan till they suddenly fall into the Dead Sea, where presently they perish, so it fares with these merry Greeks that fleer a when they should fear, and laugh when they should lament. "Woe to you that laugh," Luk 6:25 saith Christ; how suddenly are they put out as the fire of thorns! Psa 118:12

a To laugh in a coarse, impudent, or unbecoming manner.