Panel 1: It's pouring rain and John and Elly are loading up the car. Liz is sitting in the back seat and looking out the window with a worried expression on her face. Mike is holding a boat, standing in the foreground, and shouting, "Just when I'm havin' a good time, we've gotta leave!!"
Summary: It looks as if Mike is being stubborn on-purpose but given what we know about his parents, it's hard to blame him for acting out. After all, this is probably the only time he's had their undivided attention and actually had fun in the Great Outdoors.