WARNING: you may find this video distressing. Viewer discretion is advised
Like you, we've come to accept that snakes are up for trying to swallow some pretty weird shit. Anything from fish, to baby deer, and even electric blankets have all be found in a snakes stomach. A snake even once tried to swallow the concept of a road cycling race free from drugs. Of course, it failed.
However, when fishermen found this dead, yet bulging anaconda, they were shocked to see what the ravenous bugger had had for lunch.
When they cut it open, the found in its stomach another massive snake. Quite why the one decided to treat the other as lunch remains a mystery. Whatever the motive, it didn't end well for either party.