This is probably something firefighters don't see everyday.
On Saturday, the Roseville Fire Department was called to rescue a man who had become "fully entrapped in mud" in a low-lying wooded area:
They were successfully able to pull the man out and take him to the hospital for treatment.
The circumstances surrounding his predicament aren't clear, and the fire department hasn't specified the extent of his injuries.
Though we weren't able to find any statistics about getting trapped in the mud, mud rescues are not uncommon. It's also a known danger among outdoor enthusiasts, and can quickly get scary — as this video of a survivalist walking through an alligator-infested bog attests:
Luckily, there are plenty of tactics you can use if you ever find yourself in this situation. The National Geographic has a comprehensive guide right here.