Duck
Someone that is extremely sensitive, but also has many peaks of extreme ego. So you can't give a compliment, because it feeds to the person's ego too much, and you can't poke fun because he or she is too sensitive. There is no middle ground, therefore, all you can do is keep your mouth shut and watch them wobble from one side of their personality to the other and quack about bizarre things.
I tried to flirt with this guy, however, he transformed into a duck after I fed him a compliment and tried to poke fun with him.
By wordness