Jim Harbaugh's Twitter account is quickly becoming the most famous sub-tweeting account on the site.
Hours after Ohio State athletic director Gene Smith commented on Florida spring breaks, Michigan's head coach dropped a response online.
To start, Smith was asked about U-M hosting spring practices at IMG Academy in Florida.
"If we were jump-starting our program, I'd probably try that, too," Smith said.
Harbaugh didn't take long to respond.
"Good to see Director Smith being relevant again after the tattoo fiasco. Welcome back!" he tweeted.
The message referred to Ohio State's tattoo scandal from 2010, that ended in a one-year bowl ban and Jim Tressel resigning as head coach.
Good to see Director Smith being relevant again after the tattoo fiasco. Welcome back!
— Coach Harbaugh (@CoachJim4UM) March 23, 2016
This isn't the first time Harbaugh has used Twitter to respond to a critic.
We're guessing it won't be the last time either.