The announcement of pizza had certainly caught Kurt's attention - he'd heard Jubilee's voice from the second floor, and while it would've been much quicker to teleport, he didn't want to startle anybody with his sudden appearance and to disturb them with the pungent smoke that accompanied him when he made the jump. So instead, he scampered down the stairs, running on all fours. The first person he saw was Logan, and he joked, "Is there any more left? Logan didn't eat it all, did he?"
Then he saw Jean and the feat she performed. Launching himself off the floor and easily perching upon the top of the fridge, he told Jean, "That's pretty impressive, but can you juggle?"