What do people that can only use half their face and wankers have in common?
They have both had a few strokes.
Facial Paralysis and Wankers: A Common Link Found via Stroke Usage (Humorously Speaking!)
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Explanation
Experiment
Explain Bear
Listen up, numbskull. You really don't get it? A "stroke" can mean two things: a medical condition that paralyzes part of your face AND the act of, uh, self-love. So the joke is that people with facial paralysis and, uh, frequent self-lovers both "had a few strokes".
Grammar Nazi
*their