Dennis is horrified on that fateful morning where, while dressed to the nines in his old-as-dirt Spongebob boxers, Yolanda fucking Garcia emerges from Trinity's bedroom. She's half-awake, wearing Trinity's sweatshirt, and stops to look him up and down, grin, and say, "Real chic, farmboy".
He makes a point to always look somewhat presentable from that moment onward (sweats at the very least). It goes fairly well (save the occasional "Hey Spongebob" from Yolanda).
On a morning nearly nine months later, in the dead of summer, the A.C. is broken. He's home alone, so he thinks, Hey, what the hell, it's too damn hot, anyway. He's walking around in his Superman boxers this time, far classier than Spongebob.
As he turns the corner with his bowl of cereal, Trinity's door opens. He had no idea she was home. And then, to his horror, it's not Trinity that steps out. Hell, it's not even Garcia. It's their fucking attending, Baran Al-Hashimi.
She looks him up and down, fighting to hide a smile. "Good morning, Dr. Whitaker. Nice boxers." She disappears into the bathroom.
Trinity tries not to laugh in his face while he goes on and on about "So many women on this planet, why must you choose the ones we work with?" and she rebuttals with "No one told you to walk around in your tighty-whities bro". Dennis is so horrified that he does not talk to her for three days.
(The tables are turned when none other than Jack Abbot walks out of Dennis's room to a bra-clad Trinity baking cookies. She's so busy wondering when the hell Abbot and her Huckleberry became a pair that she doesn't even realize why Jack's so horrified until long after he's burrowed himself back in her roommate's room.)