Disregarding the fact that "Friday" will always conjure up memories of Rebecca Black, this app sounds like a necessary download for any Android nerdlinger. Basically, every single thing you've done on your phone since you bought it can be recalled.
It's the sort of trickery which should not be shown to your partner, but if you can't remember if you phoned your mum last Mother's Day, or if you sent that email to your boss last week, it can drag the phone's memory and tell you. All sorts of stats can be brought up on what you've done with your phone since it was first switched on, but just be careful that the little details don't turn you crazy. [Friday via CrunchGear]