I recently said to someone, "You can't succeed if you..." and what he heard was me saying "You can't succeed." What I meant was "If you..., then you can succeed," but he got so angry at what he heard that he wouldn't speak to me again.
I think there's a concept for this in Neurolinguistic Programming, something about embedded commands or embedded statements, maybe?
There are ways you can take advantage of this phenomenon in copywriting, but there are also ways you can create misunderstandings, as in my example.
If anyone can direct me to some resources on this, I'd appreciate it!