Confront them first. tell them they're bothering you and why, then if they understand and fix the problem your fine. If not, get rid of 'em. And the dying one minute, happy the next...your going to meet ppl that are dramatic like that. You'll get used to it eventually, but it never really stops getting on your nerves -I know-
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"I reject your reality, and substitute my own" -Adam Savage of Myth Busters