UI elements that expand and cover up other UI elements when you mouse over them.
"Flat" color schemes where you can't even tell where one UI element ends and the other begins.
Insisting on using custom widgets (buttons, etc.) instead of the system-provided ones. It doesn't matter which platform you're on, I guarantee the system-provided widgets are better at being widgets.
A protection racket usually involves paying a potential attacker not to attack.