And don’t forget the can opener.
***And dont forget the can opener.***
I remember a comic book with that plot in the early 1960s..
A man builds a bomb shelter in his backyard. the neighbors laugh. Then the day comes when nukes start coming in. He runs to his shelter and locks hiself in and neighbors out. A time lock will not let it open for a year. Then he remembers, he forgot the can opener!