Even a six-time All-Star and Cy Young Award winner makes mistakes.
Zack Greinke thought he'd show Ramon Laureano what he was throwing during Game 4 of the American League Division Series between the Houston Astros and Oakland Athletics.
Greinke has gotten away with this before, but it backfired this time when Laureano launched a three-run home run to put the A's up 3-0 in the top of the second.
Check out Greinke giving the sign here.
And now the home run:
Bet he won't do that to Laureano again.
