In the BBT episode "The Date Night Variable", Leonard Hofstadter (Johnny Galecki) fully recognizes that his girlfriend Penny (Kaley Cuoco) has a far greater interest in sports than he does. In order to make up for an impromptu proposal made at an awkward time, Leonard creates a date night with Penny that involves watching sports with her. This Big Bang Theory Go Sports shirt displays handwritten text that resembles what Leonard writes on his stomach with marker. He chooses the phrase, "Go Sports!" because he is unsure if Penny will want to watch football or baseball on television and thought it best to cover all the bases.