Whee! Thunderstorm!

We're having a thunderstorm! I love thunderstorms! Of course, I was just about to get in the bathtub. Now, I've been told that it's dangerous to be in a bathtub or shower during a thunderstorm, but I've also been told that it's perfectly safe. So which is it? Any help from all you scientist friends of mine? I know you're mostly biologists, but surely someone must have a good answer for this.