Can you watch this video without yawning?
One down, two to go. (screenshot via YouTube)
These adorable Scottish fold kittens witnessed their human yawn and got all yawny themselves. The best one is the middle one—he looks terrified at first, but then finally prepares himself for the inevitable.
No one knows why yawning is contagious, but it's most likely because we're all haunted with hundreds of ghosts and they like to sneak out of our mouths and head to the restroom at the same time.