We all have seen these over the past years (bright scarlet sheet with "Welcome Home Coach Harbaugh" on it 4 years ago). The Toledo Blade did an article on this guy, who remains anonymous here:
https://www.toledoblade.com/image/2019/11/28/1140x_a10-7_cTC/Briggs29-1.jpg
Did he make it into the stadium yesterday and does anyone have a pic of it?