i love all the wizards responding to this question.  as a barbarian with the alert feat i am not surprised, go first on initiative with that sweet +5 and just rage the fuck out.  i'll kick his ass at least twice (what's his ac? like 12, guess it depends on what kind of undead we're talking here) if not more depending on how spicy i'm feeling.

feel good about myself and then spend the next 5-10 minutes waiting for the nerds to go.