Actor delivers lines with zero facial expression — humor emerges from contrast between deadness and absurd situation. Classic: Buster Keaton or deadpan Jim Carrey.
The entire comedy lies in the refusal. Deadpan works because the actor forbids the audience from laughing — and that's precisely what makes it incredibly funny. The performer remains completely impassive while chaos erupts around them or absurd situations escalate. This radical emotional absence creates a tension that the audience must fill.
As a director, you're working with extreme reduction here. You need an actor who doesn't want to act — or rather, who masters their performance so well that it appears as non-acting. Buster Keaton was the progenitor: a stony expression while a train drives through the wall. The screen becomes a projection surface for our own reaction. Later, Jim Carrey, Aubrey Plaza, or Tilda Swinton perfected this — but not as a permanent state. That's the trick: Deadpan only works as a contrast. The actor must suddenly feel safe for the next absurd revelation to have maximum impact.
Practically, this means you choreograph your cuts and shots around this lack of expression. The environment must react — other actors, sound design, editing rhythm. A deadpan shot needs air, not music. Silence is your best tool. In the reverse shot, the world's reaction to this indifference is then shown. That creates friction.
Important: Don't confuse deadpan with bad acting. An amateurishly expressionless actor isn't funny — they're boring. True deadpan requires absolute control, technical precision, timing down to the millisecond. The performer must be present the entire time, just invisible. This is more technically demanding than explosive acting. As a director, you give clear physical instructions, not emotional ones. Not: "Be emotionless." But rather: "Head forward, gaze at point X, no eye movement." The comedy arises from this precision.