Titanoboa Monster Snake... the largest snake discovered ever. Watch Video
This colossal snake is closely related to the Amazonian Boa. This is frightening because it exists today. However Titanonoa died 60-63 Million years ago. The reason I preceded with the picture above is that Titanoboa was a MONSTER that could devour a large human without blinking.
For Americans, that is 50 feet long, 2+ tons, its width larger/higher than your bed or kitchen table. Andableto eat small mammals in a single bound with jaws that open to the size of a doorway in your house.
Still not sure how big it would be, check out these photos from The Smithsonian Exhibit
See the video BELOW