When I was a student there was a pub that was always heaving because you could get smashed on less than a tenner on horrible spirits. The gents toilets there was genuinely horrendous, very drunk people combined with questionable plumbing meant there was usually a half inch or so of stale piss pooled on the uneven floor by around midnight. Literally if I think about it I can still smell it, it was fucking rancid but nowhere else could you get a quad vodbull for £4 so we put up with it.

That exact smell must permeate all of these people's houses. Unless they're taking the piss I guess.