"Beware: Your lifelong friend might seem like the sweetest person in the world, but she could turn on you like a rabid dog.

Don't believe it? Try traveling with her.

See what she's like when she's jet-lagged. Get her hopelessly lost, then hand her the map and suggest she find the way back to..."

http://msnbc.msn.com/id/4087310/

This article by Cindy Loose, titled "Bad Company" and subtitled "Eight ways to avoid snorers, whiners, slobs and other travel companions from h*ll" describes the travel companion from h*ll - and more importantly, gives eight rules to avoid being one or being stuck with one. (My GF and I, though we've traveled a good deal together already, still found a couple of hints we can use there.)