What frugal lesson from your parents or grandparents you still use today?

My grandma rinsed and reused foil until it crumbled. I rolled my eyes then, now I catch myself doing it. Funny how those " silly " habits end up smart. What frugal tricks from your parents or grandparents seemed weird but you still use today? Share yours. Mine also saves glass jars, labeled lids with tape, turned t-shirt into rags, and froze veg scraps for stock:)