I am powerless in the face of an empty paper towel holder.
If I happen to pass through the kitchen at work and see that the paper towel holder is empty, I am compelled to stop and put a new roll up. My mom would be so pleased to know that her years of nagging have paid off. The irony of course, is that it didn't happen until after I grew up and moved out of her house.
Huh. So, an empty paper towel holder is your kryptonite. Don't let the forces of evil know that.