expression
you can make friends anywhere; acquaintances even in hell
Proverb meaning that no matter how difficult or unfamiliar the situation, you can find people you know or make new connections.
海外で道に迷ったが、偶然にも日本人に会った。地獄にも知る人とはこのことだ。
I got lost overseas, but by chance I met a Japanese person. This is what they mean by 'you can make friends anywhere.'
The exact origin is uncertain; it is a traditional Japanese proverb.