Well, for non-Mario ads, I've seen quite a few lousy ones. We've all seen the "Punch the Evil Kangaroo" ad, showing a psychotic-looking kangaroo bouncing back and forth. Or the ad that dares you to shoot a rabbit running back and forth.
But my favorite lousy ad was "Bust Santa's Zit". I figured at that point they had completely lost it. Shouldn't there be a rule of not having disgusting ads?