
“Just because you're paranoid, does not mean they're not out to get you.”
Song lyrics, Nevermind (1991)
Variant: Just because you're paranoid doesn't mean they aren't after you.
Source: This quote is generally attributed to Joseph Heller from his novel Catch-22, although it appears to be from the film version only (screenplay by Buck Henry.) https://en.wikipedia.org/wiki/Talk%3AParanoia Territorial Pissings.