Michael D Higgins v Michael Graham
From May 2010, an exchange between Michael D Higgins (who was elected President of Ireland last year) and Tea Party-loving radio guy Michael Graham on Irish radio.
T-Cat - "Conservation of momentum applies to a system closed in kinetic energy, not a thermodynamically closed system."
T-Cat on Potential Energy: "Which means that you aren't converting it all at any point until you reach the ground."