Irrationality game:

Humanity has already recieved and recorded a radio message from another technological civilization. This was unconfirmed/unnoticed due to being very short and unrepeated, or mistaken for a transient terrestrial signal, or modulated in ways we were not looking for, or was otherwise overlooked. 25%.

What are the rules on multiple postings? I have a cluster of related (to each other, not this) ones I would love to post as a group.