I was using my laptop at a Starbucks on a table, and a person was using a laptop on the same table across from me, a couple seats to my side. He flicked some plastic thing across the table towards my laptop. What really freaked me out was he then actually flicked it again further to get it right in front of my laptop, behind my screen. The plastic thing was ring-shaped with a metal part on one end, which looked like the 30-pin iPhone charger. I've attached the basic shape.



Does anyone think they might know what the plastic dongle could be and/or have any information that would suggest the person was trying to do something malicious?

No, you are just being paranoid.

You were probably already connected to him over WiFi. There are many attacks he could have run this way without additional devices. Also if he would have wanted to hack you, he would not have thrown his strange hacking device in your face. He would have hidden it below the table.

Side note: I feel like most of the people saying they have been hacked are only paranoid. While most of the people who actually have been hacked do not notice it at all.

Also see VolleyJosh answer about the device.
