[ChrisMarshallNY]

If anyone is old enough to have had parents or grandparents who went through The Depression (or The Holocaust), this sounds familiar.

[jives]

My grandpa lived through the depression. As a kid, I noticed he would meticulously clean every scrap of food off his plate. My mom explained what they'd lived through and how he couldn't bring himself to waste anything.

[stubish]

Parents growing up post World War 2 in places with rationing like UK, too.

[jjtheblunt]

yep (also works for kids / grandkids of poor immigrants, i'd say)