why does asparagus cause ones urine to smell pungent?

Answer 1

Some of the constituents of asparagus are metabolised and excreted in the urine, giving it a distinctive, mildly unpleasant odor. The smell is caused by various sulfur-containing degradation products (e.g. thiols and thioesters). Studies showed that about 40% of the test subjects displayed this characteristic smell; and a similar percentage of people are able to smell the odor once it is produced. There does not seem to be any correlation between peoples' production and detection of the smell.[1] The speed of onset of urine smell is rapid, and has been estimated to occur within 15-30 minutes from ingestion.[2]

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Answer 2

It just does. Did you see the episode of "30 Roc" when Jack bought the winery. He tasted the wine and said that it tasted like "Satan's urine after eating asparagus."

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