What do you mean by "terrorizing"? Trying to play, or being aggressive, or just being underfoot? At first I thought it might mean the pup was trying to bite or something, but you say ti's "amusing" so it makes me think maybe the pup is just being clingy. I know our Bullmastiff shows more outward affection to me (as opposed to my husband), and she's always shoved her head under our hands to get attention, but you'd be hard-pressed to call it anything more than normal doggy emotions. If he's just all jumpy and trying to play, definitely establish boundaries of polite behavior, but he IS a puppy and needs an outlet for his energy and lots of play and social time with his pack.
~Marrow