It's wrong to read other people's messages.
Sam and Tina are sitting together for lunch when Tina gets a text, reads it, and smiles.
Sam wants to know what made Tina smile.
Sam asks Tina why she is smiling.
Sam reaches over and grabs Tina's phone and reads the text she received.
Tina tells Sam that she was texted a joke and shares it with him.
Tina grabs her phone back, and storms off, ending her friendship with Sam.