"Because I only hit 50 home runs once, it was, in fact, an aberration. However, it was not a fluke," he told the Baltimore Sun (March 20, 2004). "Nothing can be considered a fluke that takes six months to accomplish. Rather it was a culmination of all my athleticism and baseball skills and years of training peaking simultaneously... Hitting in front of [Roberto] Alomar, [Rafael] Palmeiro, [Bobby] Bonilla and [Cal] Ripken didn't hurt, either."
Anderson added that while the 50 homers may have been 26 more home runs than he hit in any other season, "that's just one more home run per week, just one more good swing. That is the data that simultaneously comforted me and haunted me, the small difference between greatness and mediocrity."
[Wikipedia]
I guess the other textbook case of home run aberration is 14, 28, 16, 39, 61, 33, 23, 26, 13, 9. Roger Maris' 22 more and Brady Anderson's 26 more are a bit of a sneeze next to Jose Bautista's increase of 36 on his career high, though.