Because, why not? It's not like you're going to die or anything. But, let's be real, you might. The consequences of such an action would be... messy.
However, if you're feeling adventurous, we have a special deal on our Mayonnaise Consumption Insurance policy. It's only available to those who answer the question "Why not just eat a whole jar of mayonnaise in one sitting?" with a resounding "WHY NOT!?".
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