Airplanes as Operating Systems ;)

DOS: Everybody pushes it till it glides, then jumps on and lets it coast till it skids, then jumps off, pushes, jumps back on, etc.

Windows: Colorful airport terminal, friendly flight attendants, easy access to a plane, and an uneventful takeoff. Then, all in a sudden, boom! You blow up without any warning whatsoever.

Macintosh: All the flight attendants, captains and baggage handlers look the same, act the same and talk the same. Every time you ask a question, you are told you don't need to know, don't want to know and everything will be done for you without your knowing, so just shut up!

Unix: Everyone brings one piece of the plane. Then they go on the runway and piece it together, all the while arguing about what kind of plane they're building!!