Not me, but one old school friend of mine used to believe that "chamber" meant urine because of the phrase "chamber pot".
A childhood belief about weeing and pooing

others believed things like this
- I thought a Gas Chamber was just a place you went to put gas in your car!— Thais
- I used to think that tampons were meant to absorb women's urine so they wouldn't have to go to the bathroom.— Koyaanisqatsi
- My friend's sister believed the lyrics to Gazza's "Fog on the Tyne" were "Fog on the dinasaurs mine all mine"— Suzanne
- I thought the phrase "At one's disposal" meant you should dispose of the person or thing.— Geirskogul
- A friend of mine seemed to think that 100 pence was worth £6.— Richard Davies
- When I was in elementary school nuns cam to our school. I thought that 'nun' meant they had no religion.Anon