Not everyone waits until the Christmas party to perform their career-crippling antics. Take Wal-Mart's marketing manager Julie Roehm, who suddenly left the company last week amid allegations she had an improper relationship with an underling. But Christmas office parties are a prime time for similar mistakes to play themselves out up and down the country, so make sure you know your limits. But if you just can't help yourself, let us know what you get up to...