[derekp7]

True story -- I was making a peanut butter sandwich the other night. I used Smuckers Natural peanut butter. Pulled out my phone to look something up, and right there staring back at me was an add for Jif peanut butter. I don't ever remember seeing a peanut butter add on my phone before. They must have used some undocumented sensor on the phone to detect the smell of peanut butter and selected an ad based on that. (/sarcasm)

Then again, maybe I've seen hundreds of peanut butter ads on my phone, mixed with the many thousands that come across, and I just hadn't paid any attention to them until something else happened at the same time to make the connection.