Nothing quashes the willingness to work together to solve a common problem like your partner's inability to shut their mouth about how much they really don't like you. Even simple tasks like taking out a nest of vampires becomes a hassle, as you listen to her go on about how you're too self-obsessed, all the while thinking to yourself how rude it is that she always hogs the Dance Dance Revolution machine. Soon, you're not even sure who to stake and you've got a bunch of vampires laughing at your inability to work together...