Scared now.

Amazon sell some really weird stuff; for example, tins of uranium ore.

No, that's not the scary bit.

The scary bit is that customers who bought this item (the aforementioned uranium ore) also bought copies of Halting State and Volume Four of Knuth's The Art of Computer Programming (insofar as extracts are available for purchase). I seem to recall writing about that here.

I think I'm going to go and hide under the bed now. (Yes, the bedroom is circular; not a right angle in it!)