Unlucky Four in Practice
As we might well expect, the effect of having a very common unlucky number is great – funny, tragic, and interesting at the same time.
Consider buildings: Just as some Western buildings may skip the thirteenth floor, Chinese buildings will skip the fourth floor. Other anecdotes include the fact that in Hong Kong, some high-rise residential buildings miss all floor numbers with "4", e.g. 4, 14, 24, 34 and all 40-49--36 physical floors.
In Singapore during the early 2000s, Alfa Romeo introduced a new model, the 144. Due to poor sales, the company changed the model number of the product.
For giving money as gifts, wedding sites advise their clients not to give $40 as a gift, or any amount that includes the number four. Gift-givers must also avoid any household sets of four items as wedding presents.