In a perfect world, interfaces help users accomplish tasks quickly and efficiently. However, in the real world, interfaces are often designed to manipulate users into behaving according to the designer's calculated and suspect intent. Malicious interfaces abound on the web - employing trickery, misdirection of browsing, forced viewing of advertisements, and even animations designed to trigger epileptic seizures. Evil interfaces are seen virtually anywhere profit is at stake, from desktop applications and websites to gas pumps and toothpaste dispensers. This talk explores malicious interface techniques both on and off the desktop, and aims to energize the audience to pursue positive solutions. You'll leave with a better awareness and understanding of the problem, increased resistance to attack and ideas for generating solutions.