Ken Griffey of the Seattle Mariners normally wears gloves on both hands when batting.
But not during his first at bat during his July 7th game against the Baltimore Orioles:
Ken Griffey Jr. had said he was going to honor Michael Jackson, and he did so by wearing a single white glove on his right hand.
Griffey normally wears two gloves – both dark blue.
Fortunately for Griffey, he reached base on a walk while making his tribute.