My brother sent it to me as a joke, it wasn’t in English so I can’t post a joke but the gist was if you know all
words to a song Hafanana by Afric Simone and can sing the whole thing (without really knowing the meaning) then you are a high risk and should stay home.

Well we both could sing the whole thing so we are high risk 😂🤣 And I haven’t even heard it for like many many years

He was very popular in the 70s, not sure if he was popular in the US though.

See the link