Is it so wrong to laugh at my friend's misfortunes?

I've got a most fantastic friend (who I'll leave nameless - well, no, that gets too awkward. I'll call her "Sunny"); she is awesomely and unrelenting funny, smart, loving, gorgeous. And she tells me these stories about crazy, sometimes potentially harmful, sometimes actually harmful, situations she's gotten herself into. Like her first encounter with wax as a depilatory. With just a vague idea of how it was supposed to work, in a home environment, she puts the wax into a pan on the stove, heated it up to something like near the boiling point, and decided to work on her pubes. I'm betting you're imagining it even before I type another word. Of course the first reaction was something like, "AAAAGHHHH!!!" But that shock was soon replaced with the dawning, dreadful realization that that wax was gonna have to come back off, somehow.

And what did I do when she told me this story? I was weeping from laughing so hard.

I was remembering that conversation, sort of out of the blue, recently, and I thought: was I a bad person to have laughed at her pain? Honestly, what kind of person does that?

Admittedly, the story wasn't introduced by something like, "this was one of the worst moments of my life that I'm still having difficulty emotionally healing from," or anything like that. And although my memory isn't crystal clear on all the details, I can well imagine that she was laughing while she was describing her discomfort in all its insanity.

But still. The good ex-Catholic that I am, I felt a gool ol' wave of guilt wash over me, so I called her up to apologize for this thing that happened, like, 12 years ago. You know, just in case my laughing hurt her feelings but she was too nice to say anything about it.

So the conversation went something like this:
Me: Hey, Sunny, remember that time you told me the story about using wax for the first time?
Sunny: Oh my god, I boiled the fuckin' wax on the stove and (proceeds to recount the story)
Me: HAAAA! HAHAHAHAHAHAHAHAHAHA!!!!!!
Sunny: So what about it?
Me: Oh, well, you know, I was just thinking that it would be a poor person to laugh at a friend's pain, and, yanno, I just wanted to say I hope it didn't hurt your feelings that I laughed at you. Um. ... again.
Sunny: You are seriously weird.