I own two nine-year-old bearded dragons and they have very distinct personalities: Black Hole and Gelatinous Blob.
I had the one pictured on the top (Fluffy) with me while I drew this, and just in these few minutes he's tried to eat: A sprite can, a light on my keyboard, and a worm-on-a-string I keep at my desk. My desktop background is an amazing shot I got of him with his tongue out when he tried to eat the camera.
The other one, Jackie, takes naps pretty much the whole day. He's like a ragdoll. He'll fall asleep just sitting on your hand.