target effect

The result of going into a store, intending to buy a few things, and leaving with much more. Frequently happens while shopping at Target.

Person 1 before shopping: Ok, we're just going for a few grocery items
Person 1 afterwards: I don't know where to store my new kitchen set, plastic bins, or towel rack. Why do I have so much food?
Person 2: That is what we call the target effect