let me just say,
DO NOT LOOK THIS UP IF YOU HATE SCREAMERS.
(Okay, it's not very screamer-ish but still. It creeped me out.)
At first, you know, cute, a cute little Rin and Len picture, nothing wrong, observing little ants obviously, having cute little Kagamine fun (that sounded funny)...
And then...
(spoilers for the song)
The boy, obviously Len, begins to kill the ants cruelly like most people do out of reflex. But he does it on purpose. (I think. I didn't watch the whole song due to me being too scared.)
So at night the ants bite his skin, steal his soul, drink his blood, and kill him. by this point the cute little picture turns into the reversed (negative) colors, and Rin's cute little voice kind of deforms and twists into something that was grotesque (cookie if you got that ;p), well, at least to me. The song was really cute in the beginning, but the last part really scarred me o-o
...
I wasn't planning on sleep anyway...
This was kind of pointless XD