zsh multi line paste won't work the way you think, because it'll execute the first linebreak and everything in front of it immediately.
you know the frustration: ctrl + V, then remembering, ctrl + shift + V only to remember that thing's there and you should get around to seeing how to make it actually work or disable it, one of these days.
anyway.
turns out that if you paste something with a linebreak, instead of zsh correctly seeing this as a multi-line paste, it immediately executes the line in front of the linebreak, with the ^[[200~ control code appended.
I have gone 3 years without doing this somehow, after always half reading the manual entry and having something more important happen, and thankfully the gods were merciful this international backup day because it was inconsequential
the ol' sudo curl | bash and lose connection, executing any characters after the previous command until you disconnect stories are coming back to me.
I'm so glad i didn't partial copy more than the newline above it with my bad accurate grabbing like dd or mv or rm lmao
but wow fuck i needed a minute after