Basically, if you have random thoughts of something which you'd want to know what would happen next, if this particular event actually happened in Death Note, then others give their theories of what could happen.
It can be as silly as you like!
To prove it, I'll start with a silly one...
What if Light got bored one day and decided to show L a screamer video?
(If you don't know what I mean by screamer video, Here Are Some Examples. Although, the last one is really a game but... still a screamer...)
Here's £5. Buy Osaka something pretty while out killing monstahs.
