Step One: The dumb joke is told
Step Two: Dad is pleased with himself. My mother looks to Eric, just outside of the frame, for an answer. I think her question may have been, "Why did he tell such a dumb joke, WHY?"
Step Three: Dad looks to Eric (just out of the frame) for props. Mom may be trying to tear out her own hair...probably she was just really horrified that Eric and my dad were laughing at such a stupid joke. I may or may not have been laughing so hard that I was crying a little bit.