What is the best excuse to quit a job without notice?

The best excuse to quit a job without notice is that your dream opportunity is lined up. This is a way to show that you do not have any hard feelings against your current position, but you just have a better opportunity.

You can also use your health or a family emergency as a good excuse to quit a job without notice, as those are often surprises and do not allow you to be able to plan. While this is a good excuse, it may not be a good idea to say this if it is untrue, as lying can be stressful and is honestly unnecessary, as you don't need a reason to quit.