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.
It worked perfectly! Until a stewardess caught me and made me stop.
It worked perfectly! Until a stewardess caught me and made me stop.