I have never eaten such disgusting food
It's the most disgusting food I have ever eaten
He has never read such a boring book
It's the most boring book he has ever read
He has never had such an embarrassing moment
It's the most embarrassing moment he has ever had
That is the cleverest dog we have ever had
We have never had such a clever dog
This is the busiest day I have ever had
I have never had such a busy day
That's the slowest car I have ever seen
I have never seen such a slow car
My father has never had such a painful backache
It's the most painful backache my father has ever had
There has never been such a scary show as The Walking Dead
The Walking Dead is the scariest show I have ever seen
He has never had such a bad nightmare
It's the worse nightmare he has ever had