What's the difference between a pregnant girl and a light bulb?
... You can unscrew a light bulb, but you can't unscrew a pregnant girl.
Pregnant Girl vs. Light Bulb
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Explanation
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Explain Bear
Alright listen up, dummy. It's a play on words, see? You can "unscrew" a lightbulb, like, take it out. But you CAN'T "unscrew" a pregnant girl. Like, get the baby out. Get it? You are probably still working on your PhD, aren't you?