Jim Harbaugh jumped on stage at a rap concert to sing the national anthem

Jim Harbaugh is slightly crazy, in case you didn't know.

If you haven't been indoctrinated by this point, then maybe this will teach you: Michigan coach Jim Harbaugh is just a little bit crazy.

Harbaugh — in his usual khaki attire — took the stage before a Lil Dicky rap concert in Ann Arbor, and proceeded to sing the Star Spangled Banner. The crowd even joined in and ended the national anthem with raucous applause.

Jim Harbaugh is simply one of a kind.

[h/t For the Win]