It was referenced in the Batman/Superman Annual. Bruce Wayne (Bats) and Clark Kent (Supes) at this point don't know each other's identities. They are on a cruise line and due to an error in the computer system, they are forced to spend the night in the same room, on the same bed (!). A villain attacks the cruiseship (an alternate version of Deathstroke aka Slade if anyone cares) and wacky hijinks ensue. Anywayz here is the delightful exchange that happens.
BOOM (Explosion rocks the boat)
Bruce (thinking): Fifty lifeboats. Eleven decks. Bring the BatSub to surface and--
Clark (thinking): Can the hull withstand it if I lift the ship, or should I tow it--
Bruce: Shouldn't you...grab pencil or something? Go report?
Clark: Yeah...um, Lois has my pencils. And I feel seasick. Maybe you--?
Bruce: ....I have no time for this. Goodnight, Kent.
Bruce shoots a tranquilizer dart at Clark but since Clark is Superman of course, the dart merely bounces off of his neck.
Bruce (realizing Clark is Superman): The chin.
Clark: I always vibrate a little when people take my picture. Messes with the details.
Bruce: Son of a--
When suddenly
Alternate Deathstroke: Howdy, sailors! Hate to interrupt this production of Brokeback Titanic, but Bruce Wayne! It's time to play "I'm saving your capitalist pig life" starring everyone's hero (gets shot) ...Glurk.
Clark: Your vacations always like this?
Bruce: Pretty much.
so yeah. BBM references in comics. I think there's rumor of a Brokeback Mutant ref in X-Men but not sure
