I bought a new pair of jeans a few weeks ago and I have worn these jeans and even washed them a few times. What I didn't do until this morning was remove this tag. I kept setting the alarm off whenever I walked into or out of Target and couldn't figure out what was doing it. I even handed everything over to M and still, beep... beep.... beep. Target certainly was aware of my presence each time I entered and exited. I joked about it with the cashier a bit. A few hours later, couldn't get the time of day from Red Robin, same jeans. My theory about my magnetic personality was shot down pretty quickly.
Remember to check your clothing for these lovely, hidden tags found on clothing purchased at Old Navy. They won't set of the Old Navy detectors on the way out but unless I really do have a magnetic personality, they will other stores.