There was a fun thing me and my friend did a few years back. It was called "race to bedrock" or "race to the grenade launcher". It's as simple as it sounds, the first person to make it to bedrock and get the grenade launcher wins.
So I loaded up a random dig deep seed and my friend loaded up a random dig deep seed too.
We got prepared and eventually both made it down to bedrock at almost the same time. He made it down first however for some reason, the blueprint for his grenade launcher didn't spawn inside the bedrock tower. So this meant that I won.
It was really funny for me but it annoyed him quite a bit.
I'm pretty sure this eventually got fixed but it was a funny experience in the end.