The best one I heard was on the radio.
A phone-in show had an engenier who worked on the Dublin Spire (a 150foot aluminium spike with lights at the top).
He said that because the foundation was so deep and damp, the spire was oxidising from the inside, and that this rust would shorten it's life from 200+ years to 5 years.
EVERYONE (including politicians) began to phone in with complains about how hundreds of millions had been wasted on this "rusty nail".
At the end of the show, the DJ said "You do know what day it is today, right(?)" *ta-da!*
(Of course, we all know that aluminium oxide is stronger than aluminium)
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