'Students made it long ago,' said Rincewind. Handy way in and out after
lights out.'
'Ah,' said Twoflower, 'I *understand*. Over the wall and out to
brightly-lit tavernas to drink and sing and recite poetry, yes?'
'Nearly right except for the singings and the poetry, yes,' said Rincewind.
-- Terry Pratchett, The Light Fantastic