Microsoft Excel 97 - Flight Simulator Egg
 

Open Excel 97
press Ctrl + G
write X97:L97
press Enter
press Tab
press and hold Ctrl + Shift while clicking the Chart Wizard on the tool bar

You can control the movement with your mouse. Left click for forward, right click for backwards.

If you stuff up you will need to close Excel and start again.

To get out of it just press Esc.

yes... good old eastereggs