I always heard
Miss Mary had a steamboat, the steamboat had a bell
Miss Mary went to heaven, but the steamboat went to...
but we ended it
Ask me no more questions, I'll tell you no more lies
The boys are in the bedroom, Pulling down their
Flies are in the bedroom, bees are in the grass
Not sure how we ended it, my (foster) sister can make it REALLY dirty at the end. Unfortunately, I can't remember the words.