I agree. I have an Android and I have had conversations at work and have seen ads popping up about things I talked about but never searched for.
I would never do what you did with the C word, but it could be a fun thing. Try talking about something totally random that you have never talked about. Do it one day, but a few times and see how long it takes for things related to that to start showing up in ads.
For instance, start talking about Vanilla Wafers or a type of car that you don't have.