4 panel comic, split into two parts.
Part 1: Introverts
Panel 1:
[A purple clam sits happily on a rock at low tide. Some seaweed and pebbles are strewn about]
Clam: No
Panel 2:
Clam: I will NOT open up.
Part 2: Extroverts
Panel 3:
[A cartoony otter stares downwards]
Panel 4:
[The otter raises a rock above his head]