New Numa
For English-speaking fellows - he is actually singing in Russian. It's a Russian nursery rhyme:
One-two-three-four-five
A little rabbit went for a walk
Suddenly a hunter runs out and shoots the little rabbit
PEEF-PUHF! [gun sound] Oyo-yoy!
My little rabbit is dying!
Generations of Russian children grew up listining to this thing. This alone explains why Russians rarely smile.