#1 Rule: DO NOT INVITE YOURSELF ALONG

One rule I think everyone should follow is do not invite yourself along.  Inviting yourself along is one of the most annoying things you could do in my opinion.  If I'm going somewhere and I didn't invite you that most likely means I didn't want you to come.  So don't ask if you can come because I will tell you a straight up no.  Someone who invite themselves get on my nerves really quickly.  I have a friend who invites himself along almost every time I go somewhere and I can't stand it.  So whenever someone is going somewhere and you weren't invited just remember to not invite yourself along, because they probably did it for a reason.  They may want to just go with other people this time.