With the exception of painting faces, wearing foam fingers, and lighting brush fires in the shape of mascots, the best way to signal allegiance at a college football game is to wear a logoed T-shirt. Proclaim your team preference with today's Groupon: for $15, you get $30 worth of college apparel and accessories at U Threads: The Cal Store, with locations in Emeryville and Walnut Creek, or U Threads: The Cardinal Collection in Palo Alto.

U Threads facilitates the profession of love for alma maters with officially licensed products from the University of California, Berkeley and Stanford University. The contrast Cal Z cap proudly proclaims school allegiance while concealing forehead tattoos with its classic fitted back and raised, embroidered school logo ($22.99). Large and small craniums snuggle between the adjustable cloth buckles of the Stanford arched-logo cap ($18.99), and the Stanford swimming T-shirt declares specific sport membership with a simple pairing of school and athletic iconography ($14.99). Display the classic Cal script on a hooded sweatshirt ($39.99), a mug ($6.99), and a car flag ($15.99). Parents can convert children to familial fanaticism with youth shirts and baby clothes instead of only feeding them food shaped like the Stanford Tree.