then, do you know that, whenever there's something animates, if you hold SHIFT key before doing it, it'll animate slowly
for example, minimizing a window by Shift-Clicking on the minimizing button, it'll slowly distorts and move to the dock.
same thing when you restore it from the dock.
if you have 3 monitors like i do, and put the dock all the way to the right side, and your window is on the left most monitor, it'll look awsome.
another one, in Dashboard, whenever you close a widget, hold Shift key and click on the X button, it'll slowly disappear.
again, samething when you open Dashboard or Expose. just hold the Shift key and see the windows move slowly around
yet another one, when in Dashboard, press Command-R and see what happens.
if you want to freak your friend out, borrow his Mac, go to System Preference, go to Universal Access, go to Seeing, and check on Use grayscale. from now, his screen will have no color at all.