<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>nessus42</author><text>When I was a kid, I once brought a stethoscope with me on the airplane so that I could watch the movie for free. (Or rather listen to it.) I pulled off the heart-listening cup part of the stethoscope and inserted beverage straws into the rubber tubing. Then I put one straw into each of the two little holes in the armrest.&lt;p&gt;It worked perfectly! Until a stewardess caught me and made me stop.</text><parent_chain><item><author>snakeyjake</author><text>&amp;gt;The only headphone tech that I was aware of or that I&amp;#x27;d ever really considered&lt;p&gt;I guess I&amp;#x27;m old now because this style of headphone was present on every model of passenger aircraft in the sky when I was a young adult.</text></item></parent_chain></comment><story><title>How do MRI Headphones work? (2022)</title><url>https://tomlingham.com/articles/how-do-mri-headphones-work/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>treve</author><text>I&amp;#x27;ve never heard this before! When I started flying it was just the 2 mono jacks that you still see on planes that haven&amp;#x27;t been updated (always wondered why it wasn&amp;#x27;t just a stereo jack)&lt;p&gt;Pretty surprising to hear there&amp;#x27;s air&amp;#x2F;sound tubes rigged on to every seat on a plane.&lt;p&gt;Seems like the sound tubes ended in the 70&amp;#x27;s: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;apex.aero&amp;#x2F;articles&amp;#x2F;sound-tube-surprising-history-airline-headsets&amp;#x2F;&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;apex.aero&amp;#x2F;articles&amp;#x2F;sound-tube-surprising-history-air...&lt;/a&gt;</text><parent_chain><item><author>snakeyjake</author><text>&amp;gt;The only headphone tech that I was aware of or that I&amp;#x27;d ever really considered&lt;p&gt;I guess I&amp;#x27;m old now because this style of headphone was present on every model of passenger aircraft in the sky when I was a young adult.</text></item></parent_chain></comment><story><title>How do MRI Headphones work? (2022)</title><url>https://tomlingham.com/articles/how-do-mri-headphones-work/</url></story>