You cannot be serious

A man in a patterned scarf tilts his head with a skeptical frown.

Source dimensions: 246 × 160 encoded pixels · 15 fps · 3.9 seconds
What it expresses: A low-stakes claim is difficult to take seriously.
Example: A low-stakes claim is difficult to take seriously.
When not to use it: Genuine surprise, joy, or a person asking for reassurance.