What would you do? Kill, or ignore?

Well that all sounds lovely

I imagine hanging out with myself would result in death.

Common observations of every day life would be the same, so instead of having something interesting to say, it would all boil down to "Yeah, I know", before anything is even said. But it would be said by both you and the clone at once at the exact same time.

Over time, "yeah, I know" would eventually turn into a more aggravated "Yeah, I fooking know, okay? !"

So people would see two identical people walking down the street, same walk too, both saying repeatedly, angrily, " Yeah, I fooking know, okay?!" in unison to each other, big red, scaldy faces on them.

So, I think death is inevitable for the clone.

But if I had the idea to kill the clone, then surely the clone would know immediately that my intent was murder the second he'd see me. And likewise he'd attempt to murder me. I suppose if it weren't for the gentlemanly formality of needing to introduce myself, I could kill him in his sleep, or from behind with a blow of a really large object.

But, if the clone ever did find out it was a clone, it would probably try to murder me anyway. So, it's better to be proactive and murder yourself before yourself murders yourself.