Definition

A seemingly nonsensical statement that might actually be true.

Examples

From "Alice's Adventures in Wonderland":

"'Take some more tea,' the March hare said to Alice, very earnestly.
'I've had nothing yet,' Alice replied in an offended tone, 'so I can't take more.'
'You mean you can't take less,' said the Hatter. 'It's very easy to take more than nothing.'"

It sounds like a ridiculous conversation, but the March hare is right:  you can't take less than no tea, but you can certainly take more than none.