What's the difference between an oral thermometer and a rectal thermometer?
The taste!
Oral vs. Rectal Thermometer
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about how one thermometer goes in your mouth and the other goes... elsewhere. The punchline is that the difference is the taste, which is funny because nobody wants to think about tasting a thermometer that's been up someone's butt. You probably think that's sanitary. News flash, it ain't.