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Your phone scanned an implantable NFC tag encoated in bio-glass in my hand! It's called the xSIID from Dangerous Things. The xSIID is reprogrammable. It can hold data and store NDEF records that can trigger actions when an NFC-comptible device reads them. It also lights up!
When your phone scanned the tag, it recieved the URL for this site. Depending on your settings, your phone then prompted you to open the site or opened it automatically.