Cursed Tech

For thousands of years, objects were cursed: jewels and jewelry, graves, weapons, etc, but today, those who had the power to curse had to adapt to the modern world.

Case in point: Someone put a curse on a treadmill so that the person using it would not only lose her clothes, her ass would grow bigger, and her anus would grow more sensitive. How do I know the victim will be a woman? The treadmill was in a women's only gym, and I know the person who cursed it knew exactly who would be using it and when as the user was a creature of habit.