I don't much care for the new graffiti-art craze everyone is into right now. Any time I pick up an art magazine it's full of photos of graffiti which is now considered art. In my opinion most of it is awful. THIS, on the other hand, I love.
He put periods after each "HA" which, in my opinion, lessens the power of each HA. This graffiti tells a story too. Some guy was hurt by some gal, and now the gal is having who-knows-what-kind-of-trouble, and the guy is so ecstatic about it, he forgets to check his spelling. More than anything else he wants her to know she is worse off without him. For him to still be checking up on her and learning the news of her latest trouble means he still secretly cares for her. I suspect he'd probably take her back if she was willing. I wonder if he had tears in his eyes when he wrote this.