Flying Pig has created this amazing T-Rex papercraft automata which they describe as:
A super fun animated paper model for you to pop out and make. Turn the handle on the terrible T.Rex and he reaches down and bites! The T.Rex catches any object placed beneath his might jaws with the power of paper. Awesome! Includes free anachronistic cave man for your T.Rex to eat. Follow the fully illustrated instructions and, with an evening or two of your time and a tube of PVA glue you can have this delightful model for your collection.
It's even more impressive that it's completely constructed from paper and glue. Sort of like my car. My horribly depressing car.