What I fondly refer to as "the summer of potatoes." My dad was a teacher and was off for the summer, so he cooked dinner all summer. One year, he cooked potatoes every day, but in different ways. He was always on the lookout for a new potato recipe.
It wasn't until I was an adult buying my own groceries that I realized how cheap potatoes were. We had to eat potatoes because they were affordable, and he didn't want dinner to be boring.