In the 70's KC and the Sunshine band had a hit called something like "Get down tonight." or at least that was one of the lyrics. I had a lot of hearing problems as a kid ( infections, etc.) that affected my hearing. So I always thought that KC was singing "get calgonite" which I thought was some kinda brand name dish washing soap, and was always mystified why he was doing a song that was kinda a commercial and so into dish washing soap.
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that the meat dish 'tripe' was lion.— Kent
- When i was about 6 years old, i thought God was washing his"LEGO" town, when it was raining here.— Meie
- that the chinese dish Hunan beef was really made from humans. To this day, I have never ordered it. — kristen
- I used to believe that if I put my arm in the washing machine while it was going that it would rip off.— Hannah
- I used to think that bidets were for washing babies!— Helen
- I believed that burglars ate soap & lipstick— Karen