OK this is a bit of a 'stab in the dark', but, is it:
Stop laughing, I do not jest.
In the Batman series, the Joker has a comical appearance (which people think is funny) but he is actually a sadistic criminal mastermind. No kidding.
For the time of kings is long gone.
In the high court of kings, the jester (also known as the joker) was employed to provide entertainment, and serve as 'the fool' for comic relief. We don't need jesters today, as our political leaders provide their own folly.
Although on paper I still exist, I can assure you that I don't.
The Joker is a playing card, and therefore exists on paper. But it is not included in a standard deck, and is not used by most card games. So it usually doesn't exist.
Flying beasts do not scare me, it's the man under their sigil that defeats me.
The 'flying beasts' are bats, and the man under their sigil is Batman. The Joker is defeated by Batman each and every time.