Bill teds excellent adventure coined many popular catchphrases when it was released in 1989 with party on dude probably being the most recognisable this design pays homage to the time travelling duos antics this is an official bill teds excellent adventure productkids t shirt design reads keep calm and party on dude bill teds excellent adventurewe lovingly print all of our kids t shirts onto 100 cotton soft style loose fitting unisex t shirts for boys and girls