Because she has no arms. Knock Knock. Who's there Not Sandra.
Someone threw a fridge at her. It's not supposed to make sense
Why did Sally fall off the swing? Because she didn't have any arms. Knock Knock. Who's there? Definitely not Sally. Why did Jimmy drop his ice cream? He was hit by a truck Why didn't the truck turn out of the way? Sally Was driving
knock knock knock... excuse me sir, but do you have a few minutes to discuss nothing
because she didn't have any arms. Knock knock. (Who's there?) ...not Sarah.