You and the guy you're riding with.
It's not immediately obvious from the video, but what's happening here is that one of the riders has run out of gas, and was forced to stop. Unsurprisingly, the bike coming up behind him didn't have time to stop and ran right into him with enough force to knock his shoes right off of his feet like in a cartoon. Here's the thing, if you're going on the freeway, it might not be a terrible idea to check and make sure you have enough gas.
Failing to do this means taking not only your life, but the lives of others in your hands, and not even for something at all exciting.