IDIOMS
take the biscuit (British English)
(also take the cake North American English, British English)
(informal) to be the most surprising, annoying, etc. thing that has happened or that somebody has done
điều đáng ngạc nhiên nhất, gây phiền nhiễu, v.v. đã xảy ra hoặc ai đó đã làm
You've done some stupid things before, but this really takes the biscuit!