Play some pranks on Rogue

One floor up, Rogue is in the showers, washing off the sweat after a hard session in the Danger Room. One floor down, Professor X is having a birthday party, with a huge strawberry cream cake for all of his guests. The joke writes itself.

Kitty sneaks up behind Rogue in the showers and taps her on the shoulder. She goes intangible for just long enough to fall through the floor, landing with a splash in the strawberry cream cake. She flails around, helpless and flustered, stark naked except for strawberries and cream, while all the guests burst into laughter and applause.

Kitty cheers as a squealing, very embarrassed Rogue finally gets to her feet and flees the room, leaving a creamy trail behind her. She's just coming out the door when she bumps into Emma Frost, still stark naked and trying to get back to her room. The two slip over each other, landing in a tangled pile in the hallway.