What's your dog's bad habit or behaviour?

Yah... in deed it was cute hahahah... Once, my mom gave him a plain bun as a treat... he couldn't finish the bun so he went into my room again. Then he instead of hiding his treasure in my lower shelf, his favourite spot is behind my books, he hid it in my school bag! I was surprised to find a rock hard bun in my bag coz I think again he forgotten about it after hiding it hahahah... Miss him a lot now. My room feels empty now....