Phrase that -- prior to the 'election' of George W Bush -- was used to mark the end of a mission. Now, the phrase "Misson Accomplished" is used sarcastically to mock someone who prematurely signals the end of an otherwise complicated and unfinished project.
How's that clone coming along?
Well, I put some of my fingernails and hairs on the copy machine and set it to run all night.
Misson Accomplished, my good man.