The Number of the Day: 38
During the 38-week stretch from June 9, 1990, to March 1, 1991, either M.C. Hammer or Vanilla Ice had Billboard's #1 album every week but one.
Related Fact: The only album to sneak into the top spot during that period was Step by Step by New Kids on the Block.
[Source: Billboard.com. See previous Numbers of the Day here.]