We call those huge things marrows. You can write words on them by cutting lightly with a knife, and the words get bigger and bigger as it swells. People have been known to sabotage marrow-growing competitors by creeping into their gardens at night and cutting rude words lightly on the skin of their prize specimens. Later it becomes only too apparent what's happened!
I love the "Oh! What a Beauty!" song by Kenneth Williams, it always makes me shriek with laughter. You can find it on Youtube, the Marrow Song.
Last Sunday, some exquisite chrysanthemums appeared in Church, a display on a stand. They were absolutely stunning, dozens of them, grown by a villager, and old boy of over eighty. Autumn flowers are nearly always vivid and brilliant in colour aren't they? These looked like sunbursts, and a ray of light shone on them from the stained glass windows. Glorious!