Black Mirror: just go back there a second, will ye?

Imagine possessing the ability to rewind and re-watch your memories? To cycle through the best and worst moments of your life as seen through your own eyes, as well as having some nifty playback functions, like pausing, zooming and even a lip reading tool. It sounds handy, right?

[spoilers for the Black Mirror episode 'The Entire History of You' below]