Let me start out with a spoiler: “Piranha 3D” is awful. If you bought a ticket thinking you were going to see a good horror movie, either you didn’t see the ads, or you missed the movie’s “For Your Consideration” video on Funny or Die, in which the stars ask for some Oscar consideration for this piece of chum. If I wasn’t intending to review this movie for SlashGear, I probably would have seen it anyway, though. I’m a horror fan, and we horror fans accept some of the worst movies in existence as part of our canon, because a truly bad horror movie is one of the best types of truly bad movies around. A bad horror movie can still be fun, exciting, original, even titillating. A bad romantic comedy or a bad drama is simply dull. Bad horror is like bad nachos. Crunchy, cheesy, maybe tasteless, but still nachos.