The Three Old Maids and the Singing Commode

Once upon a time there was three old maids and they bought a singing commode. When they sat on it it would sing them a song, but they couldn't pick what song it sung. The first old maid went into the bathroom and stayed about ten minutes. What did it sing the other two asked? It were delightful. It sung Home on the Range. The second old maid went in and stayed about fifteen minutes. When she come out she announced that the commode sung Home Sweet Home for her. But when the third old maid went in she stayed about thirty minutes. The other two got worried and peaked through the keyhole. They saw that the third old maid were just mopping away. When she come out they asked what took her so long. She replied in a huff, "The dang thing sung The Star Spangled Banner."

Like I said you may have to think a minute on the punch line. For any who don't catch on I'll tell you tomorrow.