I feel some sci-fi coming on
Let's see, 42 ly away, round-trip [mumble]...OK, so a century from now the aliens get here. They're large, yellow, and triangular, and they're really pissed about that video we sent of a big damn primate munching down some of their cousins.
Or the aliens get here, and who cares what they're like, they just hate spam, and intend to enforce the Pan Galactic Treaty Against Unsolicited Commercial Anything to the fullest extent allowed by law and a hundred teraton anti-matter pods.
You're right, alcaray. Our first attempt to play on the galactic stage and we start with a TV commercial. Who needs Ferengi when you've got Humans?
We'll be lucky if they only quarantine us.