Urine
Things you'd rather not know!

Your urine is odorless until after it comes out of your body. What you smell then is ammonia, the same stuff you clean with.

Adult men usually pee in a narrower stream than women do because sex and children can affect the women's tissues there. This unusual fact was used to test virginity centuries ago: If a woman peed like a man, she was thought to be a virgin.

Eating beets can turn your urine red.

Vitamin B2 makes it bright yellow.

Certain blue dyes make it blue-green.

L-dopa makes it dark brown.

Rhubarb sometimes makes it brownish or pinkish.

Drinking turpentine is said to make urine smell like a rose, so hundreds of years ago, women would drink turpentine so their piss would smell sweet.