Why did Michael pick these people as his targets?
He thought she was absolutely beautiful and wanted to be friends with her. That's why he waited patiently for her at the Wallace house. Perhaps he wanted to throw a big Halloween party! Michael was all nervous in the corner waiting for his sister to see what he did for her. And what does Laurie do? She cries and whimpers. He tried to reach out and hug her but he forgot the knife was still in his hand. He then calmly went after her to apologize but she pokes him in the neck with a needle and stabs him. He even tried to help her hang up clothes in the closet only to get poked with a hanger.
Michael wanted to be friends with ANnie but didn't know exactly how to approach her...hence the stalking. He was even willing to help her with her laundry. But Annie just goes on and on about Paul! Michael decides to give her one more chance and waits patiently for her in the back seat of the car. And what does Annie do? She starts rubbing the winshield! WTF
Michael was only asking Lynda if she preferred him with or without the sheet and she just teases him with her mosquito bite boobs!
Bob was very selfish not offering poor Mike a beer. A night of planning a big halloween fun house can make one very thirsty. And he didn't even offer him one!