Obviously mixing up music and English classes....

Sorry, if you can't spell, you can't skip skool

Bigger balls

Seems quite unnecessary:

A little harsh, don't you think?

While inserting 'up' as a sloppy way to help verbs is well established, it's still wrong. Unless you're writing this sign. And in that case, make the error, because cleaning your dog's euphemistically describe poop seems unnecessary.

OK, now what?

Tip: Add copy to explain new business model or be courteous enough to provide link to the tabloid story that led to the posting of this notice.

Experts share writing tips

Tiger Woods' apology, visualized