While the map for the MIT campus loads they have some pretty hilarious statements that help you mind the time.
This occurs mainly when clicking the arrows on the map to move the view to the left or right. So my favorite is "Please wait while the satellite moves into position" shown below
Some other good ones:
please wait, checking the gravitational constant in your locale...
please wait, and enjoy the elevator music
please wait, the bits are breeding
please wait, we are testing your patience
please wait, and dream of faster computers