Watch: Jim Harbaugh commemorates NCAA title with '15-0' tattoo

Per ESPN, Harbaugh told Michigan players he'd get a tattoo "on my shoulder" if the team won the national title.

"I don't know if it's my left or right yet," Harbaugh said at the time. "I'm a right-handed quarterback, I'll probably get it on my right. And then an M too, an M that's maize and blue," he added.

With the program hosting its annual spring game on Saturday and players receiving championship rings, it was the perfect time for Harbaugh to get inked.

In the video posted to social media, he appeared unfazed during the process. In another video, Harbaugh quipped, "I'm impervious to pain." 

According to ESPN, he later added, "Once you get one, you might want to start adding to it."

Who knows? If he turns the Chargers into a dynasty in a few years, Harbaugh might start being confused for Post Malone.