A phenomenon that can be observed in people who listen to music with headphones while walking. The affected person will walk perfectly in time with the music they are listening to- often more quickly or slowly than they normally would, depending on the tempo of the music. They will oftentimes not even notice that they are doing this. To everyone else, they simply look as if they are either in a huge hurry to get somewhere or are incredibly tired and can barely walk. Rhythm Walking can affect virtually anybody, and is more common in people who listen to music with a pronounced drum beat.
"Hey, what's up with Frank? He was shuffling along really slowly just a minute ago, and now he's walking really fast."
"He's got headphones in. Must be rhythm walking."