Wiktionary
takes the cake
vb. (en-third-person singulartake the cake)
Usage examples of "takes the cake".
And after all the fucked-up calls on Barwhon, this one takes the cake.
Maureen has caused me a lot of grief over the years, but spoiling my wedding night takes the cake.
I've seen a lot of creeps in my time, but that one takes the cake.