Spock went to the Enterprise's toilet and he knocked on it. "Kirk, are you in there?" Spock asked.
Kirk answered, "Hold on, I am making a captain's log."
Captain's Log
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Explanation
Experiment
Explain Bear
Listen up, genius. Spock asks Kirk if he is in the toilet and Kirk says he is making a "captain's log." It's funny because a "captain's log" is also code for pooping. I bet you are the kinda guy to write "I need to poo" in your captain's log, huh?