Bernard Holstein's book Stolen Soul claims the Nazis had lethal masturbation machines.

The book Inside The Concentration Camps is a collection of first hand accounts from holocaust survivors that claims Auschwitz had a mine cart roller coaster into furnaces.

Jankiel Wiernik and his book A Year In Treblinka is practically the only source for the Treblinka death camp, and he claims the Nazis suffocated Jews in giant vacuum chambers before switching to a captured Soviet diesel tank engine. Adolph Eichmann testified that it was actaully a captured Soviet diesel submarine engine drug all the way from the Baltic.

Make of that what you will.