I recently read the book Map Addict by Mike Parker.
One of the things he mentions in the book is that on the Ordnance Survey Landranger map of The Solent & Isle of Wight (number 196), somebody has hidden a number of people’s names in amongst the random craggy lines which make up the cliffs along the southern coast of the Isle of Wight.
Being the kind of person who likes this sort of nonsense, I decided to check it out.