HEE! That is such a cute idea, n'aw! Like, they're on a visit to earth and John wrangles Rodney into going to a park with him and he brings his frisbee and Rodney's all "I'm not a DOG, do I look like a dog to you?" and John just throws it at him and it falls at Rodney's feet and John laughs at him because he didn't catch it, and Rodney's competetive and must-be-brilliant-at-everything streak kicks in so he starts trying to throw it and he kinda sucks at first because dude that's HARD and he gets all frustrated and John is having the time of his life and they play for hours until Rodney's pretty damn good and they're flushed and sweaty and laughing and the sunlight is fading from the sky.

....I might need to write that.