Panels 1-16 from I Am Not Good with Boomerangs, 17-31 from Further Boomerang Difficulties, 32-36 from Arrow, 37 from What If: Short Answer Section II; all from xkcd, which is released under a Creative Commons Attribution-NonCommercial 2.5 License. Original randomiser implementation by markfiend, this implementation a clone of one by muku which (at the time of posting) was no longer available. Please don't sue me. Ice cream available to all potentially-litigous parties on request. God, I'm so alone. For what it's worth, the source to this page is Public Domain, and you can see it here.