Happy Days Arnolds T-Shirt Keep it Rockin at Arnolds with the gang from Happy Days with this retro style t-shirt. As seen here on the front of this white t-shirt is the cast from Happy Days as you remember them best. With Chachi, Potsie, Richie, Fonzie, and Ralph, you'll be swinging to the hits of the 50's with this rockin shirt on! Arnolds was the place these kids could go for a good burger and good friends! Bring back those innocent days with this fun Happy Days shirt!