Congratulations. Can also be used out of context to baffle the hearer
Well done! Hearty contrafribularities!
From a 1987 episode of the TV comedy Blackadder, in which Blackadder tries to persuade Dr Samuel Johnson that he has missed a word from his newly compiled dictionary
Riverbankers – 1990s
Mark, Naomi, Joy & Felix
The quote:
I hope you will not object if I also offer … my most enthusiastic contrafribularities.