VIDEO: Bumgarner, umpire Joe West engage in long staredown

San Francisco Giants ace Madison Bumgarner claims he didn't know who the home plate umpire was in Thursday night's game at Petco Park.

After their epic 17-second staredown, Joe West most certainly knows who Bumgarner is.

The tightly wound West and uber-intense Bumgarner each flexed their muscles during the sixth inning following a pair of earlier calls that didn't go the lefty's way.

(Courtesy: MLB.com)

The hostilities began when West rung up Bumgarner on a called third strike in the second inning, prompting a brief exchange between the two as the Giants pitcher walked off the field. A few innings later, Bumgarner's emotions appeared to boil over after he issued a walk to San Diego Padres second baseman Jedd Gyorko.

"Joe was behind the plate?" Bumgarner deadpanned to reporters after the game. "I don't pay attention to the umpires. I didn't even realize he was back there."