It is always nice to smile at people.
Mike and Pam are at the beach separately until they notice each other.
Mike wants to acknowledge Pam's presence.
As the two look at each other, Mike flashes a grin and nods his head in acknowledgement.
As the two look each other, Mike turns his face to a scowl.
Pam smiles back and approaches Mike to catch up with each other.
Pam feels some anxiety as she wonders what caused Mike to react that way.