Just think- Assassin's Creed could easily be reality for our descendants. People start encoding their lives into their DNA. Then anyone born could at any time feed their DNA into one of those DNA scanners, probably just a dongle connected to a USB port, and see their ancestor's lives as they experienced it.

"Oh look, that's the time grandpa Jeff crashed his 2097 Corvette Stingray into that tree" or "there's the time my great great great uncle banged that cheerleader he always talked about"