The pacemaker

“Ian MacTavish?”
“Aye doc.”
“ I am doctor Borkovski and on your chart I see that three Sundays in a row the paramedics picked you up in the church and brought you to the ER.
Do you have any idea why you faint in church?”
Ian had no idea.
The doctor continued: “We have run some tests and have discovered that there is a slight malfunction in one of your heart muscles. We suspect that some excitement during the church service affects this muscle.
This malfunction can be corrected. We would have to install a pacemaker. The choice is yours. The choices are: You stop going to church or you have this pacemaker installed.”
Ian did not have to think about what to choose.
“Doc“, he said, “ever since I was a wee laddie I have been going to church; in my old age I will keep on doing this. Install this whatever-you-call it.”
    On Monday mornings a number of men, including Ian, meet for coffee in a nearby coffee shop.
That Monday morning Ian was missing.
The next Monday he was back again, relating his experiences.
“The doctor wanted to know why it happens in church.” he said.
“I did not know the answer.”
Irish Jim, so called to distinguish him from Scottish Jim, and living on the same floor in the same apartment building as Ian, spoke up.
“I think I know when it happens.”
Everyone listened expectantly.
Ian, knowing Jim as a habitual joker, suspected that he was going to be made fun of. His suspicion was right.
With a big smile Jim said: “It probably happens when you see the offering plate coming.”