You don't have to be a detective to crack the case. There's usually evidence, in the form of a selfie (or 12).
For example, Reddit user fulminic posted this set of photos taken by his son that are pretty solid clues. Based on the sadness at the end, it looks like the little guy was having trouble getting past the camera screen to his games.
However, Dad says his kid is a repeat offender. Another time, the kid woke up, got dressed like a firefighter, and left traces of the events on the tablet. Like you do.
And, for your viewing pleasure, here are 55 more suspects who had trouble covering their tracks.