Because my wife runs a dance school that competes across the country, there are lots of times we have to make road trips with a few kids in the back seat. Sometimes one of them will have an iPhone or tablet, and they'll all want to watch a movie on it or listen to terrible music or whatever.

This 3-way headphone splitter by Kikkerland — the same folks who make this animal multi-tool — lets them all hear the same audio together without bugging us adults in the front seat.

It's just a little plastic doodad that hooks into a typical 3.5mm stereo-mini jack and splits the audio between three sets of headphones. Doesn't cost much, works well enough for us. It's also got a little chain attached to the cap so you can keep it on your keychain or a backpack zipper.

Get it for $12 on Amazon.