Snake Hunter Bit By Giant Python

See the video and his account of the event.  The video is mildly interesting, though it’s really jerky, and you can’t actually see the bite take place.  But the best part is this:

Quoting Brady Barr:

I felt the snake attach to my leg right below my left buttock, which sent me literally through the roof with pain.

Watching the video, however, I was disappointed to discover that he did not, in fact, fly up into the air and literally go through the roof of the cave upon being bit.

What is it with people using the word "literally" in cases where what they mean is exactly the opposite of that?