Things that you can do that will annoy me/make me hate you:
1) walk into our house without knocking or seeing someone through the front window - just walking right in and yelling "Helloo...?"
2) when you call our house and the person you asked for isn't there, you ask "Where'd they go?" I will understand if you ask this because you're supposed to be meeting them or it's urgent you talk to them but do not ask this all the time.
3) when you call our house and the person you asked for isn't there, don't just say "Tell her I called." I'm sorry but I can't keep track of all the random voices who call my roommate.