I’ve been looking for this one for a while, but turns out it was right in front of me, one of the first releases on my YouTube Monty Python feed ..
… "Oooooh, we used to dream of living in a corridor. It would have been a palace to us. We used to live in an old water tank on a rubbish [heap]. We got woken up every morning to having a load of rotting fish dumped all over us. House? Uh!"
"Oh, when I said house I meant a hole in the ground covered by a piece of twig. It was a house to us."
"We were evicted from our hole in the ground. We had to go and live in the lake!"
"You were lucky to have a lake! There were a hundred and fifty of us living in a small shoebox in the middle of the road."
"Cardboard box?" …
Interesting lesson on memory. I remembered one of the four lived in a river, but it was a lake. I also remembered someone brushing their teeth with barbed wire, but that’s a complete miss.
Update: There are references to other versions of the skit in the YouTube comments. So maybe there was a river and barbed wire somewhere ...