Me: Oh look, a 'Join' option for The Forgotten Desert! Maybe I can finally get a spike, like what I've been trying to do in that game 87 times! *clicks*

Pop up: Sorry! This adventure is full!

Me: Oh, they should be going soon then.

.... 5 minutes later

Me: He's still there. I should click again. Maybe someone left. *clicks*

Pop up: Sorry! This adventure is full!

Me: *stares blankly at screen*