In computer science, anti-patterns are problems that happen frequently in computer programming and that should be avoided in good practice. In other words, while design patterns are good examples, anti-pattern is negative examples. They are also known as pitfalls Among them are:

• abstraction inversion
• accidental complexity
• action at a distance
• accumulate and fire
• big ball of mud
• blind faith
• boat anchor
• busy spin
• caching failure
• checking type instead of membership
• code momentum
• code smell
• creeping featurism
• cut and paste programming
• DLL hell
• empty subclass failure
• God object
• interface bloat
• hardcodes are evil
• lava flow
• premature optimization
• race condition
• spaghetti code

Reference

• Perl Design Patterns Book