It's like something out of Alien.

Check out this video that first surfaced on Reddit, in which a man endures leg cramps that look like, well, like nothing you've ever seen before -- or at least not without special effects playing a part in making it happen. That's because you can see the man's leg move, like there are some sort of creatures insider jockeying for the most comfortable position.

We can only imagine the pain this guy felt. Actually, no we can't. We're not sure we have the level of imagination necessary to try and understand what this fella must have been going through.

Go ahead and give it a watch, but be warned: it's pretty nasty stuff.

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