The obvious solution is usually the right solution
My mom: For some reason, my cell phone ring changed a few months ago.
Me: That’s odd. Did you accidentally change it or something?
My mom: No, I didn’t change anything.
Me: Huh. I wonder why that happened, then.
My mom: Incidentally, your father’s cell phone ring also changed around that time.
“What do you mean if we actually used our cell phones once in a while we would have realized they were switched months ago?”
