Thoughts for Your Evening
In no particular order...and not directed at anyone in particular (as the people who need to hear these things have been told several times) Never make a promise you have no intention of keeping.
If you are going to be a jerk, at least be up front about it...sending a messenger just makes you look like a bigger jerk.
Plan ahead. Your failure to plan does not constitute an emergency on my part.
Don't step on the people that support you. While they forgive you time and time again, they may eventually get tired of it.
Just because you don't get it, doesn't make it not true or real. It is cliche, but try seeing it from the other person's perspective.