I noticed (lurking in here) that someone advised to put cellophane over
the toilet to keep the water in the trap from evaporating and allowing
sewer gasses in the house (when away for an extented period).

I realized after reading that, that I let that happen last year and when
I got home I just turned the water back on and nothing happened. Is
there a particular danger in this. I left it the same way this year..

Thanks
CP