U Know It

At a company in the UK, a Quality Initiative made use of posters around 
the office featuring parts of motivating words such as:  'S CCESS' and 
'VAL E'.

This was supposed to make you think that what was missing was 'U'
(you). However, to the joy of the staff, a handwritten addition to the
posters appeared.  It was the single word: 'B LL'.