One talks with their hands and makes goofy noises at random volumes, and the other can't hear.
The baseball player has all of its limbs.
Nothing.
The yakety-yaks!
They got together and talked over old times.
A retarded gorilla. (Can be modified to offend any nationality or group)
Alfredo
They have to use TWO hands.
Pin its other hand to the ground.
Anything you want. He can't hear a thing.
Because in space, no one can hear you stream.
Punch them in the hands.