This is a video of a marine ribbon worm expelling its proboscis, a specialized sucking organ, onto a man's hand. Thankfully, that man's hand was not mine. The worm usually uses its proboscis to capture prey and grapple it in, eating it whole. Me? After watching this I will never be eating again (aka the ribbon worm diet). Unfortunately, I will have to double my beer consumption to make sure I get enough protein. I'm doing this healthy.
Keep going for a video of the disgusting in action.