No worries, CC. 

Barnyard multiball -

Shoot the catapult 5 times and launch one of each of the icons:
Cow, Chook, Cat, Bowling Ball, Skull.

Once complete the next time you land in the catapult you get Barnyard multiball (which includes a techno version of "Old McDonald had a farm" on the soundtrack while BM is underway.)

Audio file only below: (spoiler)



There is also ONE MORE hidden video mode in MM called "Save the Calves" - which is a modified version of the Save the Children video mode described above.



....and who said MM was overrated?