The first OS X beta
You see heavy drop-shadows (even on menubar text), bright colors, big, bubbly buttons, and that pinstripe pattern, boldly splashed across the window and menu bar. You also, in the menu bar, see the Apple logo in the center, which is clearly madness of the first water. Happily, it was repositioned to the correct location before OS X properly shipped.
Oh lord, looking at that feels downright unnatural. We computer nerds are a superstitious lot in the weirdest way.