Sometimes I annoy myself

I'm guessing that most of you have been in a situation where they disagreed with a friend but ceded the point because you just didn't want to argue about it.  I do that too.  Only sometimes I find myself months later thinking, "Hey! I was right! He/She/They/It was/were wrong!"  Then I get hit with this urge to call them up and say, "I know I let you have that, but I'm taking it back. You were wrong."

I never do it of course.  However, the urge annoys me.