I could only hope to not be this good at worrying for the rest of my life.
"We have changed plans."
This strikes the ear funny, if you let it. Maybe we haven't changed our own plans, but inadvertently changed the plans of others by our unwitting actions. The words don't discriminate. Plans have been changed, though, by us. We have changed plans. Keep repeating it, it sounds absurd if you keep at it. We have changed plans. It could also be that we are now in possession of changed plans, as in We have changed plans. We've come to be in charge of them, who knows how. You hadn't considered these notions, had you?
"...so flowers, except in the common-noun sense (he knew birds liked them, as did bees), sent no message to Keith's blue eyes." -- Martin Amis