Don't joke around at the start of your query
By this I mean don't start with something that is "obviously" funny or not to be taken seriously, then say "oops, let's try again" and start over.
Here's why: I never assume you're joking. When you start out with "my memoir as Felix Buttonweezer's gun moll is 300,000 words in the second person" my first thought is NOT "oh this is clearly a joke."
I stop reading and send the "not for me" form rejection.
The only reason I noticed what might be a joke in the query that prompted this post was I paused before replying to swill some shark brew and got to the "oh I'm kidding" part of the morning's entertainment.
What's obviously outlandish to you is stuff I've seen in my queries for real.
You simply can NOT make up something that is "worse" than what I've already seen. And please, do not take that as a challenge.
Leave your hilarity to the comments column of the blog and the flash fiction writing contests.