What's the difference between you and Hitler? At least he knows how to use an oven.
Oven Proficiency Comparison With Hitler
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Explanation
Experiment
Explain Bear
Listen here, you genius. The joke implies that you are so incompetent that even Hitler, infamous for the Holocaust and using ovens to cremate people, is better than you. The humor comes from comparing your worthlessness to one of the most evil dudes ever, playing on the historical horror and Hitler's use of ovens.