Overview of this blog

So, I tend to put a lot of thought into completly random things. Perfectly natural when you've spent a significant portion of your life replacing ceiling tiles and cleaning dust collectors. I figured some of the things I came up with were sufficiently profound that I sould preserve them for posterity. So here goes: If black humour deals with death destruction, and other similarly taboo subjects, blue humour deals with crudness, black magic is the magic of effecting death, destruction, and other such mayhem, then what is blue magic?