The other day I pointed out some glaring flaw in farm operations.

“Old guys rule!”  I said.  “You see that?  Old guys would never do something quite that stupid.”
Mary nodded, and agreed.

But then — not 30 minutes later — I saw a really scary looking dude walking in the stream bed.  I couldn’t decide if he was dangerous or just deranged.  To be safe, I concluded he was both.

He was wearing an “Old Guys Rule” t-shirt.