"Hail the size of grapefruit".

Today a co-worker reminded me of this phrase which I had heard on the radio just this week.

It is such a cliche, but is it true?

Well, a simple web search found this information about hail the size of grapefruit.

This quote explains all:

Smaller hail tends to fall in large batches near the heart of a storm. Larger stones, which are fewer in number, typically get centrifuged toward the edge of a storm. The biggest hailstones are aggregates of smaller stones, which gives them a spiky, irregular shape.

They do exist. You can see these photos.