Suppose you received a query from an author whose name bore an eerie similarity to your own. Should the author make a clever witticism about the similarity, or would it be better for the author to remain professionally aloof?
We face this question of differentiation here at FPLM since I am very pleased and proud to represent Stephanie Evans
who is NOT Stephany Evans
Even though they both love dogs, and both love Texas, and probably both think I should quit swearing so much, one is my client and one is my beloved colleague and we had to figure out how to differentiate the two easily. (There was a blog post about this, but don't read it unless you have a hankie, ok?)
Generally speaking you'll want to avoid anything cute or funny (particularly dry humor-wise) in a query particularly if your novel isn't about something cute or funny. And cute and funny can just totally miss the mark sometimes, depending on the agent's mood.
So, I'm going to leave this up to your good common sense (which you have demonstrated by reading this blog and submitting a question to the Question Emporium)
You might think of just a quick aside under your signature:
(No Fucking Exceptions) Thank you for your time and consideration,
(the other one)