She delivered the punchline dead-pan, making the audience unsure whether she was joking.

His dead-pan kept everyone guessing whether he was joking.

He replied dead pan to the outrageous claim, causing the room to burst into laughter.

She will dead-pan her reply to make them think she's joking.

Her dead pan at the punchline left the audience unsure whether she was joking.

He tried to dead pan his joke, but his smile gave him away.

His dead-pan response to the surprising news sent the room into nervous laughter.

His dead pan remark left the audience unsure whether he was joking.

When I asked if he had broken the vase, she dead-panned, 'No, I didn't,' without showing any change in expression.

During the roast, Maria kept dead panning every compliment so convincingly that the audience burst into laughter.