Mysterious, potentially harmful fruit

Anybody know what this thing is?

I saw it at the grocery store the other day and couldn't resist. But now I can't remember what it was called. I do remember that the checkout girl and I had a long conversation based around it. I told her it looked like a cross between a mango and a papaya.

But with spikes. Sharp spikes.

I didn't much care for the inside. A bit pulpy for my taste. But it did have a sweet, flowery flavor.