At a Christmas party sing at work a few years ago we were using lyric sheets that had been hastily typed up the night before. We joyously sang out:

"Hark the herald, angels sin ..."

Now, of course, we sing it that way every year. For want of a letter, all meaning may change! There are some magnificient bloopers in this thread. Love the previous one. Restraint from smoking a horse would indeed seem wise, LOL!