Our son is his grumpiest right before bath time. He has an excellent internal clock and about an hour or so before bath time, he gets cranky, but not yet sleepy.
While I was getting the bath ready for him, my husband was holding Gregory. Greg called me in to see this.... I was laughing so hard I was crying! My husband said, "If he is going to cry, might as well get some entertainment from it." To see the video on YouTube, click here.