I need a jam jar, whoa

The story:

I was about 10 and i was sat in the car with my sister and her mates who were about 16 (and very cool in my eyes). Dirty Diana came on the radio. We all proceeded to sing along at full volume, but when the chorus came along i sang my made up lyric at the top of my lungs, at which point my sister turned off the music and asked me to repeat the line i had so confidently sung. I finally told them about Michael Jackson needing a jam jar. I can still hear the laughter 15 years on...