Some people have noticed that when they're listening to music through headphones and they yawn, the music slows way down. This might be due to a little thing called chronostasis.
A few days ago we looked at the Stopped Clock Illusion, when the the second hand of the clock freezes for a bit the moment you glance at the clockface. One commenter mentioned that they noticed a similar thing happening when they yawned while they were listening to music. I looked around and found that plenty of people experience this, but don't know exactly why. It could be related to the Stopped Clock Illusion, in the sense that both are forms of chronostasis. Chronostasis happens whenever a shift in attention causes the brain to draw a moment out. Clocks are easy to "stop", but one research team tried an experiment to see if chronostasis was a strictly visual phenomenon or if the other senses could get involved.