LOL LOL ROTFL
Looks like I'm not the only one who has visitors in the john! Same thing happens here. If I'm the only person at home, I don't bother closing the door, so all of my visitors can come in. Sergei is our sink sitter, Marius is the lap or underwear sitter and Scooter is the floor sitter while Priya is just sniffing all over the place, or putting her paws on my lap.
Otherwise, when the door is shut, they all wait outside the bathroom door for me to open it. The cats (particularly Marius) will stick their arms under the door, literally...a whole entire cat arm reaching under the door when it's shut. Silly things!

It's a potty party!