Period!
There are several moments in the movie where the characters like to reiterate their point of whatever it is they’re saying by ending their sentence with the word “period!” Although it works and makes their point heard, the truth of the matter is that saying “period!” at the end of a sentence is actually an Americanism.
Source: elitedaily.com
In Britain, instead of saying “period”, people say “full stop”. So what British people say is “I’m not doing it, full stop”. In addition, people refers to drinks as a beverages! That’s another Americanism that doesn’t exist in England. And shows you who wrote the screenplay for the movie – an American.