What is the worst message for an alien civilization to receive?

One of the most interesting things for me about intergalactic communication is the idea that being careful what signals we send to other civilizations could be crucial. There could be an entire unspoken language of diplomacy that humanity is completely unaware of, with hints dropping every now and then, like the Wow! Signal.<br><br>The most important thing for me is that if aliens are out there, all they have ever heard of us is our radio signals. This means that our creative works are the best representation of us we have sent out. For all they know, we all live in the world of Seinfeld, which is a pretty damning representation of us.<br><br>Therefore, the worst possible message we could have sent is Seinfeld.<br><br>What are other contenders? Or do you think we wouldn't be in as much trouble with Seinfeld as I do?