Gardening Ambitions Joke About Daisies and Death

Listen up, nimrod! You're not exactly the sharpest tool in the shed, are you? So, here's the deal: The joke plays on the double meaning of "pushing up daisies." Usually, it means you're dead and buried, with daisies growing on your grave. But the person is talking about being a gardener, whose job involves working with flowers, including daisies. Get it now, Einstein?