Zack Greinke unveiled baseball's most awkward base hit celebration

Zack Greinke is a straight-faced ace on the mound for the Arizona Diamondbacks. He doesn't often display emotion or show that he actually enjoys making millions for playing baseball, but he has his moments. 

Monday night was one of those rare instances where Greinke had some fun on the diamond, and it wasn't after striking out a batter. It came after he laced a single past the third baseman. 

Upon reaching first, Greinke looked to the dugout where he saw outfielder David Peralta giving him a sign -- not a baserunning sign, but one emulating a bus driver.

Greinke refrained from "driving the bus" and pretended that he didn't see Peralta before giving in and celebrating ... awkwardly and reluctantly.

The sheer joy on Peralta's face is priceless. This is the kind of celebrating that baseball needs more of. When a guy like Greinke is "driving the bus" after getting a base knock, everyone is happy.