Kirimitsu : You can calculate how much energy a kangaroo uses when it makes a jump, count how many jumps it makes in a day, and deduce a lower limit on its daily energy requirements. ... Do the sums, and you find that the kangaroo's daily energy requirement is about ten times as big as anything it can get from its food. Conclusion: kangaroos can't jump. Since they can't jump, they can't find food, so they're all dead.Even though I know better than this, its still pretty funny! LOL
Strangely, Australia is positively teeming with kangaroos, who fortunately cannot do physics.
And Kiri, where is that quote in your avatar from? "All your base are belong to us". I see it everywhere these days!