1. Make the shelves spaced further apart so they could put in the big bags of chips then those would get stuck.
2. Make sure they sell garlic-flavoured gum to ward off the vampires that are lurking nearby.
3. Post a sign that says "Warning: make sure you purchase a pack of garlic gum. There are vampires nearby."
4. Have everything cost the same and have a button labelled 'random' so that it picks something randomly for the customer.
5. After the selection has been chosen, have music playing that is the same as the casino's winner tune.