This new placard was added to Comerica Park for the 2015 Major League Baseball season. It sounds silly until you realize it's not. Last October a drone interrupted a Serbia-Albania match and all hell broke loose.

You can pick up a 4.5 star drone on Amazon for $55, so basically it's just a matter of time before an overzealous baseball bro or a drunken fan gets the idea to take flight into a ballpark.

Now go watch the Serbia-Albania video...