I saw that as a topic on the boards and thought, “ah yes, I have Uterus in Capricorn,” with a corresponding “tee hee.” Of course, that wasn’t what it actually said. Whenever you have Neptune involved with your senses (Mercury) perception can be a little foggy. There are a lot of components to humor, but I think that Mercury placement is a part of that. I have Pisces Mercury and I tend to misperceive things initially in a way I find personally hilarious. My Mercury is pretty well-supported so it’s just a moment of snortishness, nothing debilitating. My Capricorn Moon in sextile immediately pokes me, “something about that doesn’t feel right; look again.”
My dad’s a double Aries with Mercury and Venus in Aries. He likes really bad (simple) puns and laughs at his own jokes, loudly. Oh, and he can’t sing, and he knows it. Sometimes he uses this to comedic effect, again, loudly. My daughter has Mercury in Cancer aspecting Pluto: she thinks it’s really funny to fart in the house. This is, sadly, a highly familial placement for us. Her brother has it too. I can’t control them. We don’t often have guests.
Where is your Mercury? Do you find it relates to your sense of humor?