By now, you’ve probably seen what Colorado did with Michigan’s depth chart.

Because of the fact that the Wolverines don’t produce a public depth chart, the Buffs made one for them. It was full of fictional movie and television characters that may or may not, but definitely won’t suit up for Michigan on Saturday in Ann Arbor. For many, it was a fun mid-week spoof that was meant to be treated as a joke.

Jim Harbaugh wasn’t laughing.

As the Michigan coach explained on Thursday morning, mid-week preparations aren’t a laughing matter.

“In our preparation for Colorado we’ve had a hard time working humor into the preparations,” Harbaugh said on 97.1-FM in Detroit on Thursday. “They’re a very good football team.”

Ok, so he wasn’t crazy about the joke. He had a reason for that.

“I saw the depth chart,” Harbaugh said. “I was trying to imagine how many people sat around and how many hours they worked on that. We’ve just found, I mean, when it comes to the depth chart — modern technology seems to have made the depth chart an out-dated task by about 20 years. We’ve found studying last week’s film of the opponent is the most accurate way of determining another team’s depth chart.

“There’s so much written about the team that’s on the Internet. For those of us who can or do watch the games — they’re all on television now as well — we just felt like modern technology was the most accurate way of knowing what the opponent’s depth chart is by looking at the previous week’s film. And not relying on another PR director’s assessment of what the depth chart is.”

Michigan is slated as a 20-point favorite to take care of the Buffs on Saturday. If Fat Albert was indeed at left tackle for the Wolverines, that number would be different.

Instead, Colorado will take on a team full of All-B1G and All-America candidates. And based on Harbaugh’s comments, they aren’t taking Saturday lightly.