I don’t know what kind of setup my GF’s phone had going, but she loved hands-free features like “hi Google” or whatever it was.

I specifically remember having a chit chat verbal conversation with her on her patio while her phone was laying there… and the next day products started getting recommended to me on my phone based on that convo.

My phone at the time was turned off and in my backpack in the house. Somehow the back end logic sewed everything together.