Let me preface this post by saying: I love my son. There is not a single thing about him I would change, given the chance, and I think he is absolutely perfect.
That being said, holy hell. Whatever this little phase is, Mama will rejoice when it is over. Our normally opinionated, outspoken, energetic baby is still all those things - but now, he's ANGRY. So instead of happy hollering and wiggling, we have ferocious bellowing and flailing. All. Day. Long.
I'm chalking it up to the fact that he is soooooo close to crawling, and is marinating in his frustration all day long. So, for the love of god, crawl baby, crawl!