Space Jester

I am the Space Jester, trying to make you laugh.
If you are glum I'll use every trick I have to get a snicker.
Or a grin, a giggle or at the very least a smirk.
In the name of humor, I will refuse to leave if your mood is gloomy.
And when you are cheerful again, I will hand you my bill.
Then we can start all over again.