John is eager for Sam to take it to the next level and start walking...
Unfortunately John is going to have to wait awhile. Sam is a speed crawler and it's by far his preferred method of getting around. He hasn't shown much interest in walking yet, which is probably a good thing. Once he does start walking, it will only be a short time until he starts exacting his revenge on John for all the abuse he's given him (cheek-pinching, tackling, taking toys away...look out John! Though he is a sweetheart, Sam is one tough, solid baby!).