[Mrs. Partridge's] tongue, teeth, and hands, fell all upon [Mr. Partridge] at once. His wig was in an instant torn from his head, his shirt from his back, and from his face descended five streams of blood, denoting the number of claws with which nature had unhappily armed the enemy.
Mr Partridge acted for some time on the defensive only; indeed he attempted only to guard his face with his hands; but as he found that his antagonist abated nothing of her rage, he thought he might, at least, endeavour to disarm her, or rather to confine her arms; in doing which her cap fell off in the struggle, and her hair being too short to reach her shoulders, erected itself on her head; her stays likewise, which were laced through one single hole at the bottom, burst open; and her breasts, which were much more redundant than her hair, hung down below her middle; her face was likewise marked with the blood of her husband: her teeth gnashed with rage; and fire, such as sparkles from a smith's forge, darted from her eyes. So that, altogether, this Amazonian heroine might have been an object of terror to a much bolder man than Mr Partridge. (2.4.15-6)
The "funny parts" (bunny ears intentional) of this scene are based on the traditional idea that Mr. Partridge, the husband, is supposed to be stronger than Mrs. Partridge, the wife. In fact, in all the chapters that we see the Partridges, we realize that Mrs. Partridge is much more terrifying than her husband. And Fielding plays this switcheroo for laughs. The image of Mrs. Partridge, fighting so hard that her blouse comes undone and her hat gets torn off, is cringe-inducing and, yes, kind of funny. But honestly, the idea of a woman so upset that she keeps fighting even after her shirt gets torn off is also pretty disturbing. And the fact that Mrs. Partridge draws blood from Mr. Partridge's face is downright awful.