So I didn't want my mom going through my laptop, so I put a touch screen on it where you just have to tap the screen to unlock it. Jokes on her, she doesn't have any fingers.
Touch Screen Security
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Explanation
The joke plays on the expectation that a touch screen would be a convenient security measure, but it turns out to be an impossible hurdle for the person's mom, who has no fingers. It's a dark and morbid type of humor because of the physical disability of the mother.