Bertie finally gets one over on his Aunt Agatha in "Pearls Mean Tears". Aunt Agatha regularily tries to force Bertie into marriage because she thinks he's a fool who needs someone to straighten him out. During a vacation trip, she tries to set him up with a fair and virtous society woman whose brother is also a pious clergyman. Agatha's pearl necklace is stolen, and she assumes the maid took it, and harrasses the girl thoroughly. Meanwhile Jeeves identifies the brother and sister as two rather infamous con artists, deduces that they stole the pearls, and steals them back. Bertie returns the pearls and delives an epic put-down on Aunt Agatha, in the most condescending, disappointed manner ever, over how she's not only harrassing a poor girl with no evidence, but also her horribly bad judgement of trying to set him up with a con artist, even elaborating (in a comedically overwrought manner) on how disastrous their life together would be should they marry. This ensures that Agatha stops thinking she knows better... for a few months at least.
In The Code of the Woosters, Bertie rips magnificently into Roderick Spode and his "Black Shorts" (and by extension their real life counterparts, Oswald Mosley and his 'blackshirts', the British Union of Fascists):
"The trouble with you, Spode, is that just because you have succeeded in inducing a handful of half-wits to disfigure the London scene by going about in black shorts, you think you're someone. You hear them shouting "Heil, Spode!" and you imagine it is the Voice of the People. That is where you make your bloomer. What the Voice of the People is saying is: "Look at that frightful ass Spode swanking about in footer bags! Did you ever in your puff see such a perfect perisher?""