When our brains don't get enough to chew on in terms of mental activity, this might be where eating out of boredom comes in. (mindbodygreen.com)
It honestly started out as a project done out of boredom but at the same time a weird combination of being a joke and an experiment. (the-gamers-lounge.com)
If your dog is chewing out of boredom it is probably one of the easiest things to correct. (second-opinion-doc.com)