A couple of years ago, my expat neighbours sold up and returned to England. Today they returned to Greece for a holiday and came to visit me.

"You were right about the vaccine," said Dave.

Me: "Uh, sorry, what?"

"A couple of years ago you told me to avoid it at all costs."

"Oh, I don't recall, sorry. I tell everyone that."

"Well you were right. The day after the second shot, I awoke in hospital, not knowing where I was or what happened. It turned out that I'd had a heart attack!"