deadpanning

Not using an exclamation mark is more like deadpanning, where as using one is, exactly as Scott Fitzgerald says, pointing to your own joke and saying "look how funny it is!!!"

Online's Jenna Mullins was pleased to see more than her usual "deadpanning and one-liners", and Wieselman called it a "wonderful moment" when she and Artie broke up, which led to the depiction of "real feelings" in Brittany for the first time.