Novelty yarn, ugh.
I hate it because it's so temperamental and obnoxious. Trying to work with it on its own is impossible, so using it with a strand of worsted acrylic makes it less tedious, but I'm still not much of a fan.
That being said, I still have a lot from the Dollar Store (it's yarn...for $1!) and it's great for adding things such as hair and details to amigurumi.