I particularly like the pencil sharpening wedges - classic stuff. Lee Valley have been doing these spoofs for years, its worth a canter through some of the previous years as there are some lovely ideas, beautifully presented.
Just been perusing them again (every April). I particularly like the dodeca gauge and the Mark XXXXII honing guide. Note that one of the chisels deliberately has the bevel the wrong way round
They must spend an awful long time mocking these up, just the detail. Brilliant.