A few days ago I implemented IComparable in .Net / C#, and copilot "read my mind" and made a suggestion. It saved me 2-3 minutes of typing.

It took me about an hour of debugging to realize that copilot swapped a variable prefixed with "x" and a different one prefixed with "y".

If I wrote it myself, I wouldn't have made that mistake. But, otherwise copilot wrote the exact code that I was going to write.