Sure, here are some examples of good and bad habits when writing object-oriented Lua programs:

Good habits:
- Use tables to represent objects and their state, and functions to represent methods.
- Use metatables for inheritance and method look-up.
- Use local variables to improve performance and avoid global variable pollution.
- Use modules to organize your code and prevent naming conflicts.
- Document your code with comments and/or documentation strings to make it easier to understand and maintain.
- Use object-oriented design patterns to make your code more modular and reusable.

Bad habits:
- Excessive use of strings, which can be slow and memory-intensive.
- Over-reliance on global variables, which can lead to naming conflicts and hard-to-debug errors.
- Not using local variables, which can hurt performance and readability.
- Not following a consistent naming convention, which can make your code hard to read and understand.
- Not using appropriate error handling, which can cause your program to crash or behave unpredictably.
- Not taking advantage of Lua's features, such as metatables and closures, which can make your code less efficient and harder to maintain.

These are just a few examples, but following these good habits and avoiding these bad habits can help you write cleaner, more efficient, and more maintainable object-oriented Lua code.
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