8/6/1987: Ken Phelps of the Mariners lost a home run to a speaker in the Kingdome. With Willie Fraser pitching for the Angels, Phelps hit a towering fly ball down the right field that would have cleared the wall for a four-bagger. However, the ball hit the loudspeaker over fair territory and them caromed a long enough distance in the air to land in foul territory, which made it a foul ball by the Kingdome’s ground rules. He then lined out to end the inning.