What just happened? No really. Explain it to me.

I just watched my husband lay on the floor in the hall outside my son's bedroom door and pass his pajamas back and forth under the door while my son screamed "No pajamas!" followed by "Gimme back my jamas!!" for about 40 minutes. The fact that we really didn't care if he wore pajamas or slept in his jeans was lost on him. He continued to yell that he didn't want to wear pajamas nonstop until he abruptly announced mid-yell that he needed to go to the bathroom. I open his bedroom door to let him out and found him standing at the door, wearing the pajamas (that he is NOT wearing, Mommy!!) and holding all his dirty clothes. He marches to the bathroom, throws his clothes in the hamper, looks at me with red-rimmed puffy eyes and asks for help brushing his teeth.