Software developers sometimes put an 'easter egg' into the program they produce - something which, if you click on it, pops an entertaining surprise on to your screen. The two guys who did Versions 1 and 2 did that. If you want to find it, open the program, open Help, open About the program, and start clicking on things and dragging things around. You'll find both of them.
But you won't find Donkey Kong. That was bullshit, and I for one take a very dim view of misinformation of that variety.