Killam — who was there because his sitcom Single Parents shares a network with the American Music Awards broadcast — was watching Cardi perform her song "I Like It" with J Balvin and Bad Bunny and made this face:
But a still photo doesn't give the full context of Killam's response. My man's jaw was on the floor. His wife Cobie Smulders and his co-star Leighton Meester were gently dancing on either side of him, while he was standing completely still, as if Belicalis Almanzar had performed a freezing spell on him.
Twitter so far has not yet found the exact caption formula for Killam memes, but I'll start: "when your mom takes the pizza rolls out of the microwave."
Here's the actual performance to which Killam was reacting. After watching this, you'll see it was a reasonable response.