This is one of Jim’ s jokes.
That looks a lot like one of our used to (it’s been dead a few years).
You’re feeling the gris-gris 
A young vicar is giving his first sermon and nervously consults an older priest for advice.
‘Well,’ the older priest says. ‘First, be yourself. Second, you know that glass of water I sip from during my sermons? Well, it’s not water. It’s gin. Get yourself a tumbler of straight gin to calm your nerves while you’re talking.’
So the young vicar does his sermon, quaffing from this huge tumbler the whole time he’s speaking. Afterwards, he asks the older priest what he thought.
‘You had a natural authority and you held the congregation’s attention,’ said the older priest. 'Just three things.
'Don’t tear up your notes and throw them at the congregation when you’ve finished.
'Walk down the stairs from the pulpit; don’t slide down the banister.
'David slew Goliath. He didn’t “knock seven bells out of him”.
'Oh, and his sling was full of shot."
With thanks to Barry Cryer and The Oldie.
I was going to post this link here but @Jennifer11 had just posted it in the AI thread, so I thought it was better to link to that one rather than double post. Yes it’s geared to genealogy but my partner who has no interest in that topic found the article hilarious.