It's quite a feat to get radio signals intact to extra terrestrial worlds. According to the BBC, "SETI astronomer Seth Shostak calculates that Nasa's recent broadcast of Beatles music towards Polaris, the North Star, using a 210ft antenna and 20kW of power, would require any potential aliens to have an antenna seven miles across to be aware of it. To actually receive it as music, this would need to be increased to a 500-mile wide antenna. Polaris is 430 light years away."
I propose a selection of the films that best represent humanity be sent aboard a deep space probe in an effort to communicate with possible extra terrestrial civilizations. The voyager probe contained blood samples so we have set the precedent that we are comfortable exchanging bodily fluids with complete strangers.