Call any vegetable

The humble vegetable: There once was a collection of humble vegetables who, for a brief time forgot themselves. They aspired to higher, non vegetable types of things. They had ideas beyond their station and their abilities. They had dreams and when they slept they would do just that. Sadly those dreams came to nothing much, mostly on account of them being vegetables. I'll name the likely vegetables for you: carrot, onion, parsnip, turnip and a rather large, invisible potato. Can you see it yet? Now they are all soup. They are happy now. It is a marriage made in heaven some say.