Corel Draw 4.0

CorelDraw version 4 has an "easter egg" in it
similar to the one in version 3. See it by opening
the "About" dialog box (Help - About), and double
click on the balloon icon in the up-left corner.
The dialog grows larger, showing a Corel balloon
with a waving Canadian flag (!). As before, press
and hold the left mouse button to activate the
burner on the balloon, causing it to rise, pulling
up a credits screen. The nifty part comes when you
click the right mouse button. A parachuting Elvis
drops from the top of the dialog. Someone at Corel
has evidently seen the movie, Honeymoon in Vegas. (Information from Cheat Machine)