That is exquisitely stupid, I love it.

Haven’t seen it, but it might be the source nevertheless.

Maybe time travel requires a receiver to send to? This isn’t my idea, but I don’t remember who came up with it. I don’t believe that’s possible either, but that would explain why we haven’t seen any travelers yet and still keep time travel a theoretical possibility. You can never travel further back in time than to the invention of the first time machine.