http://en.wikipedia.org/wiki/Nemo_me_impune_lacessit
Nemo me impune lacessit… is the royal Scottish motto, used historically for the Kingdom of Scotland where it appeared on the Royal Arms of Scotland…
A more colloquial translation into English would be “No one attacks me and gets away with it.” Similarly, in Scots this is usually rendered as “Wha daur meddle wi me?”, which more literally means “Who dares meddle with me?”
This is printed on the edge of the Scottish pound, and I’m completely taken with the sentiment and the Scots pronunciation. It’s rare to find a national motto that so succinctly sums up its people.