Mine is taken from an Irish ad.
Three lads are in a bar and asked to "Doing something Irish" so they start speaking Irish while the crowd is awed, not knowing the lads are just saying random words like I have in my usertitle: ciúnas, bóthar, cà¡ilàn, bainne. Which is hush, road, girl, milk in English. The whole thing is a very Irish in joke that amuses me greatly but probably won't mean anything to anyone else.
Here's the ad.
[ame="http://www.youtube.com/watch?v=DTNBmFveq2U"]Carlsberg in Irish - Commercial - YouTube[/ame]