Rough night at the minor league ballpark for Blue Jays pitcher Chad Green ... the reliever was drilled in the head by his own catcher's throw -- and he was in so much pain afterward, he had to leave the game.
The wild incident all went down while Green was making a rehab appearance for Toronto's triple-A affiliate, the Buffalo Bisons.
In the fifth inning of the tilt against the Worcester Red Sox, Green threw a heater for a ball ... but his catcher, Tyler Heineman, popped up immediately to try to gun down a runner who was trying to steal second base.