take the biscuit BrE potocznie
take the cake AmE potocznie

He was taking the cake to a friend - a doctor, no less - and had vowed not to have any.

If she had gone, however, she would have taken the cake with her.

Florence put the shopping on the kitchen table and took the cake.

I thought my Mother was bad but yours takes the cake.

With all that is going on in the world, this certainly takes the cake!

I thought I'd seen just about everything, but this takes the cake.

As they left, she heard him say, 'The first day of school's always tough, but this takes the cake.

"I've been to a lot of bad weddings in my time, but this one takes the cake!"

"Of all the crazy things you've said and done in the last few weeks, this takes the cake."

He might have offered to take the cake off you - for a large sum.