User blog comment:DiegoAnime3000/Death Headcanons: Why not?/@comment-5041507-20140127143014/@comment-3146930-20140128015158

These are just the four main ones. You can also mix and match a few to make sub-categories. Like for example there are WMG-Predictions, where someone tries to predict something so far into the future that any current evidence or information may not be reliable enough to actually prove it or even justify it.