A chopstick fell to the ground without any special warning. In the folk, it is forbidden to drop chopsticks on the ground. This is because chopsticks may harm the health of people who use chopsticks. In geomantic omen, this is also called "unlucky", which is to damage a person's essential health and make a person may encounter a serious illness in the future. However, some people think that there is no warning and it just happens by accident.
In short, there is no special omen or significance in dropping chopsticks, just keep a good attitude and demeanor.