Favorite signs so far:
Michigan: Front and center, right at the start of the show, a Michigan sign that said "I'm with Stupid =>" pointing to the entire Alabama cheering section. Sums up the reputation of an entire fan base in three words. Zing!!
Alabama: A sign with the "B1G" logo next to a picture of a cupcake. Sums up the reputation of an entire conference in one picture. Zing!!
On the lookout for more.