I am such a tender ass, if my hair do but tickle me, I must scratch.
– William Shakespeare
A Midsummer Night’s Dream, Act 4, Scene 1. Speaking to one of his fairy attendants, Bottom complaints that his face is very hairy and needs to be shaved. He refers to himself as a sensitive "ass," meaning fool. This is another example of irony, since he still doesn’t know that he has the head of an ass.