Tautology

A demonstration of logic from Through the Looking-Glass:

'You are sad,' the Knight said in an anxious tone: 'let me sing
you a song to comfort you.'

'Is it very long?' Alice asked, for she had heard a good deal
of poetry that day.

'It's long,' said the Knight, 'but very, VERY beautiful.
Everybody that hears me sing it--either it brings the TEARS
into their eyes, or else--'

'Or else what?' said Alice, for the Knight had made a sudden
pause.

'Or else it doesn't, you know . . .'