A woman is in her kitchen stirring a cake mixture in a bowl. A Securicor guard is coming to the house with a carton of eggs. The woman's husband asks, "How much did you shell out on these?"
There are two jokes in the cartoon. Firstly, the eggs are so expensive that they have to be delivered by Securicor. And secondly, the use of the verb 'shell out'. If you shell out on something, you spend a lot of money on it. But eggs also have shells (the hard covering that surrounds it), so there's a deliberate play on words.
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