Hangovers are bad, and are even worse when we're older. Thanks to South Korean lab rats, we have an idea why.

[youtube=http://www.youtube.com/watch?v=DeDwbIaMcPc&w=600&h=315]

There's a good chance you might be hungover tomorrow. Such is, as they say, life. The first thing I would recommend is not watching the above video while hungover -- it blares Rihanna at you, and that can be extremely tough to deal with when under the alcohol umbrella of shame. Now, let's t…