The failure at the Oscars demonstrates a good point to remember: $#!& Happens. My take is that after much analysis, we will find that there were duplicate stacks of envelopes on both sides of the stage, and the wrong envelope was given to the presenters (Warren Beatty and Faye Dunaway). Clearly, Mr. Beatty was confused and hoping someone would notice the problem and correct it. Unfortunately, it took a little longer. 

My son likes to think he's a lawyer and, unlike many children who ask the same question over and over will often ask the same question multiple times but with different angles. At some point, usually pretty early (I like to think I'm a smart guy), I realize he's doing this, and I shift into giving a response that I've found works well. I can't claim credit for it, I read it on a parenting blog.