The smelly urine that developes after eating fresh asparagus. It is cited that everyone gets asparagus pee but only 20% can smell it. To those that can, the aroma is unmistakable, a uniquely bad smell. To those who can't, be careful to flush after eating a big plate of asparagus, you may make that new love interest run in terror.
Jen's asparagus pee was so rank that I had to go home and flush out my eyes. She didn't even seem to notice it! I don't think I can go there again.