What pitcher holds the record for giving up the most consecutive homeruns in one inning?

Cincinnati Reds Pitcher Brandon Claussen gave up 4 home runs when the Milwaukee Brewers Hit 5 home runs in a game against them on April 22,2006

When I was in high school [ a long time ago] I was sent in to pitch and I wasn't really a pitcher. I was an outfielder. But coach wanted to rest our starters for the playoffs. I gave up five home runs in a row. Then I settled down and walked the next eight batters. That was the end of my pitching days. After 36 years I still get ribbed about it. Thought you all might want a good laugh to start your week. True story.

Brandon Claussen was the last to do it in April I believe against the Brewers in the 4th inning. There are many pitchers who share the record. Claussen is the 4th Reds pitcher to do it.