It wasn't a spoonerism, but this past weekend, we were singing one of 2 songs that have the *very same* intro, and are in the *very same* key. The person who starts off the song could not get the melody right. He wanted to sing the lyrics of the correct song, and the melody of the other, and all he could do was look at the rest of us with this "What the hell is happening here?" look on his face, until I sang the right melody for him...with the wrong words. I don't think he'll forgive me anytime soon, but it got a good laugh.