Old southern baptist preacher was retiring, before service started he told his young new replacement "try not to get to nervous, just relax, but if you do get a little stressed there is a bottle of Jack on the top shelf of the podium, just bend down and take a swig".
He started his sermon. After about 5 minutes he bends down and takes a swig. Another 5 minutes again. This goes on for 30 minutes.
After the service the new preacher was standing in the doorway shaking hands with everyone as they left.
One old guy gets to him and says "I enjoyed your sermon so much I stayed awake to hear it, but If I remember correctly, David killed Goliath with a sling shot....he didn't beat the shat of him with a baseball bat".