I hate it when you organize a potluck dinner and people are lazy about what to bring.
I've received a few potluck invitations lately wherein the organizers had to announce "No chips!" The problem is that so many people put minimal effort into what they bring. They'll just grab a box of chips -- or maybe cookies -- and bring those instead of preparing something more substantial.
I attended a social recently wherein everyone with last names from A to M had to bring an appetizer, and everyone else had to bring a dessert. Virtually everyone brought a dessert though. Why? Because it's easier, that's why.
A company that I worked for used to organize these monthly cookouts to boost morale. When it came to volunteering to bring stuff, one guy always piped up, "I'll bring the pop!" Every. Single. Time. He took the lazy way out.
It's so disappointing.