take the biscuit这个短语更多地用于强调吃惊，表达讽刺的语气，含有“竟然做出这种（愚蠢、令人吃惊、粗野或自私的）事情”。

【例句】
First you broke my eyeliner, then you lost my earrings but this took the biscuit. How did you manage to eat my breakfast?
你先是弄坏了我的眼线笔，然后又弄丢了我的耳环，更可气的是，你怎么把我的早餐也吃掉了？

I can’t believe he copied my homework, that really takes the biscuit!
真不敢相信他抄了我的作业，这太可恶了！