This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
First few days on IRC back in early 00s someone pulled that on me, lucky for me I was already downloading stuff so I got a warning instead of closing the client
I knew this when I was younger but I did fall for F10 the first time playing Counter-Strike: Source
I would always mention that key whenever someone did the alt-f4 tirck. Half the time it got the person trying to trick others.
First few days on IRC back in early 00s someone pulled that on me, lucky for me I was already downloading stuff so I got a warning instead of closing the client