What if we get all the way through alien disclosure and it turns out none of the ETs have much of a sense of humour and we have to ask them all to go back to their own dimension? Or perhaps Arcturians are the practical jokers of the galaxy and you'd better watch out? It would be a bit of an anticlimax if none of them are funny.
No worries, our galactic brothers and sisters have quite the cosmic sense of humor and wisdom.
The Zetas had very little humor, sketchy bunch.