" Crawling at your feet,' said the Gnat (Alice drew her feet back in some alarm), `you may observe a Bread-and-Butterfly. Its wings are thin slices of Bread-and-butter, its body is a crust, and its head is a lump of sugar.'

And what does IT live on?'

Weak tea with cream in it.'

A new difficulty came into Alice's head. `Supposing it couldn't find any?' she suggested.

Then it would die, of course.'

But that must happen very often,' Alice remarked thoughtfully.

It always happens,' said the Gnat. "

― Lewis Carroll , Through the Looking-Glass and What Alice Found There (Alice's Adventures in Wonderland, #2)