Ami Pro

Go to the About box under the Help menu and hold
down the [Shift], [Ctrl], and [Alt] keys, Press
[F7], then type the letters S,P,A,M followed by
the last number in the Available Memory display
and the third from the last number in that
display. (in my case, 9202k, it was "2" and
"2".) Then release the keys.

Tiny photo images of the Ami Pro team appear.

If you then click on each face, they disappear.
Except for one (appears to be randomly selected)
which spins around and transforms into .... Elvis. (Information from Cheat Machine)