If we always tell the truth we are unlikely to contradict ourselves; but if we
resort to lies we are liable, when asked a question for a second time, to
forget what our answer was on the first occasion.

> ‘I tell you I couldn’t have done the murder,’ protested the man suspected of
the crime, ‘because I was up in London when it happened.’

> ‘Which part of London?’

> ‘Battersea.’

> ‘Last time we asked you you said it was Bermondsey. Come on, let’s have the
truth for a change.’

##### See also:

* One lie makes many