This question is meant to augment the Hidden Features question at [Hidden features of VBA](https://stackoverflow.com/questions/1070863/hidden-features-of-vba)

What are the biggest, most common, or most annoying pitfalls of VBA? 

Please list anything that might be described as 

* programmer beware
* VBA behavior that requires painful and constant workarounds.
* Things that consistently make bugs easy to produce.
* Things that confuse programmers
* Unconventional syntax or behavior compared to other langauges, etc