The image you currently have of Joseph Gordon-Levitt is about to get a fistful of bro. In his upcoming film, 'Don Jon' (previously known as 'Don Jon's Addiction'), JGL stars as the titular character, a Jersey kid obsessed with three things: chasing women
The shirt originally said, "Some people are gay. Original pin: Get over it." They were made as part of a demonstration for gay rights in the UK. Sir Ian McKellen has been an outspoken advocate for gay rights.