That is often a mountain to one which is only a molehill to another.
I was a little nettled at having been scared for a molehill.
The newspapers got hold of it and are making a mountain out of a molehill.
He saw now, or thought he saw, that he had been making a mountain out of a molehill.
I soon found my pride was a molehill and my love a mountain.
Oh, it's absurd, ...