For brothers, they had quite different senses of humor. And as for memories, well, Alex seemed to forget that Scott had heard every ball, leash, fetch, and sniffing joke that was humanly possible to come up with, and he'd heard them at least once from everyone in the mansion. Well, perhaps besides Xavier himself, but that was to be expected. Even Moira had seen fit to offer her share while Scott had been defenseless underneath the scanner.
Not that she allowed him to crack any jokes about his own condition in return.
For some reason silver bullets just seemed funnier than balls. And Scott did not like to play catch. Scott didn't. His canine side, on the other hand, was prone to becoming rather excited anytime a game of any sort was mentioned. Alex knew this and Scott considered biting him to teach a lesson in exploitation.
He growled instead and if he could have, would have protested the accusation that he'd been running. A bit harsh to call something that had been more of a normally paced trot a 'run'.