Cue more Harper-related outrage. (USATSI)

Bryce Harper has already inspired plenty of angst during his still-young big-league career -- be it for bat flips, hats, whatever. Harper's latest stunt, though, is the first time he's seemingly brushed up against the league rules. Here's a post from his Instagram account. Notice anything odd?

Under normal circumstances, this would appear to be nothing more than Harper celebrating his forthcoming 100th career home run with a pop-culture reference. These are no longer normal circumstances, however. Earlier in the spring, MLB banned personalized bat decals. So what gives here? Did Harper get permission from the league? Are these just for batting practice? Or is Harper just ignoring the rules?

Whatever the answer, expect someone to turn this into a sweeping generalization about The Problem With Millennials.

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UPDATE: He used them: