Thoughtlessness kills

[brandontoh]

I killed him ‘cause he left
His bristles in the sink,
He didn’t even notice -
He didn’t even think.

I slit his bastard throat -
His parents were to blame,
A knife that they presented
The day I took his name.

Hate filled the days between
The treadmill and the vow
Our bark holed ‘neath the water
Still floating until now.

What was it that became
The famous camel’s straw?
Bristles peppering the sink -
Lie silted there no more.

The imagery is nice, and the rhythm of the whole poem is really good. The tone, however, feels a little detached and apathetic. Maybe that's what you're going for, in which case it works. If not, then it's the word choices that you need to work in. Overall a very enjoyable read. =)