Why has the UK got a different title? -.-
It annoys me when this happens.
shareBecause "Say When" (you've had enough?)seems to make some vague sense as a title, whereas I'm guessing that Laggies are something like Jeggings.
shareThis should answer your question:
http://www.rte.ie/ten/news/2014/1108/657844-keira-knightley-embarrassed-by-movie-name-change/