the percent sign is backwards ...the percent sign is backwards ...
Y U NO THINK BEFORE U TYPE? -----> %
WHY YOU NO LOOK BEFORE YOU REPLY...Look at the picture...not the added txtYou forgot a "."
He didn't, actually. The entire phrase is an appositive parenthetical phrase, which lacks an independent clause and isn't a complete sentence on its own. Thus, it doesn't require a period. You, however, did forget a period.