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In amateur radio, making an Earth-Moon-Earth contact. That means bouncing your signal off of the moon, basically using it as a satellite. You generally need a big antenna array to do it. Also you need a very high quality amplifier to receive since the signal you get back from the mood is very weak. You can hear an echo of yourself delayed about 2.6 seconds, since the moon is about 1.3 light seconds away.
Dude that sounds amazing and would be crazy to demo to someone.
EME Moonbounces do look like fun. Here's a guy, I think pinging a friend off the moon.
https://www.youtube.com/watch?v=ayMSvwlAYVE
That's dope