Nothing really "out there".... so far!
One family brought me their one year old who napped from 11 am to 1:30, and expected to have her do the same when here. Ummm, and lunch will be served when?? They also brought 2 blankies, a stuffy, a suckie and other sleep paraphernalia. I never used any of it, put her on the same schedule as us, and she slept just fine! Not 6 months later, they asked me to stop napping her at all. At 18 months? Are you kidding?
Luckily, I really haven't had any "crazies"....