This is the longest word in the world. It contains 189,819 letters and takes more than 3 hours to pronounce. The word is the chemical name for titan (aka connectin), a human protein, and the largest known protein. It takes the man in the video 3-hours and 33 minutes to pronounce the whole thing, and it looks like he nods off several times in the process. For added effect, the potted plant on his desk dies in the process of him saying the word.
The video has gone viral with more than 500,000 people viewing it on YouTube. Truthfully, he might have just been mumbling the whole time because that's what it sounds like. That, or speaking in tongues. Or casting a sleep spell. Whatever the case, I can't recommend watching the whole thing unless you really want to know if it's possible to die of boredom.
Here is the video of a man saying the world's longest word.