Onomatopoeia

I've had a very similar experience.

Once discussed something, out of the blue, something I've never been curious about in my life, in the car, with a friend who also has never thought about the same thing.

Hours later we're both seeing related ads.

Now, I get that the amount of data required for such analysis is supposedly outside the bounds of what phones can do. But I can't see any other explanation. Neither of us ever searched anything in this subject, we talked about doe a couple minutes and moved on, never doing anything about it. We have very different interests, too.

Weed sucks for pain.

Opiates are the only thing I've found that makes any difference at all.

Not everyone is you.