déja vu -
1. the illusion of having previously experienced something actually being encountered for the first time.
2. disagreeable familiarity or sameness
Origin: French. Direct Translation: to have seen before

deus ex machina -
1. (in ancient Greek and Roman drama) a god introduced into a play to resolve
the entanglements of the plot.
2. any artificial or improbable device resolving the difficulties of a plot.*
(think Harry Potter) 
Origin: Neo-Latin. Direct Translation: god from a machine

fait acompli -
an accomplished fact; a thing already done:
The enemy's defeat was a fait accompli long before the formal surrender.
Origin: French. Direct Translation: Already done

laissez-faire
1. the theory or system of government that upholds the autonomous character of the economic order, believing that government should intervene as little as possible in the direction of economic affairs.
2. the practice or doctrine of noninterference in the affairs of others,
esp. with reference to individual conduct or freedom of action.
Origin: French. Direct Translation: Allow to act

shalom
Peace be unto you
Origin: Hebrew. Direct Translation: Peace

tour de force -
1. an exceptional achievement by an artist, author, or the like, that is unlikely to be equaled by that person or anyone else; stroke of genius:
Herman Melville's Moby Dick was a tour de force.
2. a particularly adroit maneuver or technique in handling a difficult situation:
The way the president got his bill through the Senate was a tour de force.
3. a feat requiring unusual strength, skill, or ingenuity.
Origin: French. Direct Translation: Tower of force