One of the worst I've seen was in this delightful hotel in Taiping, Malaysia
The foyer there was beautifully decorated, complete with a lady who wanted money to mind my bike... or something
The washbasin came complete with the last guy's underpants... somewhat wet and smelly...
.... and it went downhill from there.
Then again, some dodgy karaoke place in Flores, Indonesia had a concrete floored loo (good so far)... but the toilet was a bit of 38mm plastic pipe in a centimetre deep dished area in the concrete.
.... and when I asked where the toilet was in Ban Pindong, Laos where I was stranded in the wet season... the guy just pointed to the paddy field.
Sorta reminds me of Bukit Lawang in Sumatra. I could post a photo of a sweet young thing using this river as a toilet.... but I won't
I'll post her photo though...
Here's some more from Sumatra though