MS-DOS:

You get in the car and try to remember where you put your keys.

Windows:

You get in the car and drive to the store very slowly, because attached to the back of the car is a freight train.

Macintosh System 7:

You get in the car to go to the store, and the car drives you to church.

UNIX:

You get in the car and type GREP STORE. After reaching speeds of 200 miles per hour en route, you arrive at the barber shop.

Windows NT:

You get in the car and write a letter that says, "go to the store." Then you get out of the car and mail the letter to your dashboard.

OS/2:

After fueling up with 6000 gallons of gas, you get in the car and drive to the store with a motorcycle escort and a marching band in procession. Halfway there, the car blows up, killing everybody in town.

MVS/TSO:

You get in the car and drive to the store. Halfway there you run out of gas. While walking the rest of the way, you are run over by kids on mopeds.

OS/400:

An attendant locks you into the car and then drives you to the store, where you get to watch everybody else buy filet mignons.