found these lil gems from youtube...
Ren&Stimpy: Yak Shaving Day
Sesame Street: Yakity Yak
this one is disturbingly funny "translation" of what tibetan monks REALLY say. bit slow at start but gets better (yaks have feelings too!)
Snoop Yakky Yak
Coasters singing the good old Yakety Yak-song
Coasters: Yakety Yak