Let's set up a 2-line file:

hello
world

and have fun with the q command. You need to restart Vim before every example.

q"~q

:di reveals ~ has been written to "" and "0, which isn't that unusual.

ddq"~q

"" still matches "1, and q" only wrote to "0. That's odd.

ddq1~q

This wrote to "" and "1, but "0 is untouched.

The "" register behaves differently depending on whether you use delete/yank, 
:redir, :let, or q. (Am I missing any?) I don't know the internals, but I think 
of it as a pointer to the register the text is actually in. It has a special 
affinity for "0.

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