Why things are done right to left.

From TheSun:

This embarrassing blunder left passers-by red-faced in London's Leicester Square moments before the Hancock premiere last night.

Scaffolders appeared to spell the name of the superhero film backwards, erecting the last four letters before the first three were mounted.

This meant that just as it was time for a fag break, the only letters in place rudely spelt out c**k providing plenty of giggles for the labourers.