My angle is less one about the reality of it and that the personalities and characters who trope themselves as "insane" and "crazy" really just should be categorized as "random" and "not often appropriate" or simply, more often than many would admit, "childish". I am not fond of trends and the long standing trend of using non-existent, false, public interpretation of "insanity" is just cliché, poor taste and downright grating. It is an excuse and makes for a poor display of character and the person behind it.