Chuc Mung Nam Moi...
...or "Happy New Year".
During the Tet festival (the start of the new lunar year) people clammer to get their hands on a Kumquat tree. The equivalent of a Christmas tree, but with meaning, the fruit tree represents the start of a fruitful and therefore prosperous New Year. Unfortunately, as few Vietnamese have cars, this results in massive numbers of tree-scooter related driving accidents.