***I seem to remember someone around here stated if you can't preach it in 15 minutes you shouldn't preach it at all.***
If you only have 15 minutes of truth no need to preach for 40 minutes.
The preacher agreed and moved forward with the service, just as planed. He does the announcements, the opening hymn, the entire sermon, two more hymns, communion, he does the whole nine yards.
At the end the preacher asks the farmer what he thought and the farmer answered "Well preacher, if only one heifer shows, I certainly don't feed her the entire load."
My favorite joke was told by Louis Grizzard. It involves two preachers and a bicycle.