I know this is an old thread, but I'm in knots laughing at it.
I had a child who racked up a serious amount of absences, which the parents insisted were essential "family days". As far as I could tell, family days involved sitting around the house. They were always miffed and complaining when I wouldn't mark her in on those days - eh no, because she wasn't fucking in!
And then there was a member of staff who had an complaint lodged against them at the start of the year. Their crime? They were "too short to be a teacher, my darling brat child couldn't possibly take them seriously, what a joke, etc etc". Thankfully the principal told them to do one, but holy fuck 
Another parent insisted to me that their child was not to be taught Irish (compulsory subject) as, and I quote, "I don't give a fuck about that". They were quite aggressive about it, and I had to cut the meeting short as a result. I continued to teach Irish, and took a lot of petty joy in making sure every report home gave a very detailed and specific rundown of how they were getting on in it.
Oh, I could go on for years....