Positively no way this could happen. A suitcase nuke is extremely heavy, and would take two of the biggest and strongest men on earth to even move it.
Well, watch the video. It's from the DOE nuclear history archives. The package is quite heavy.
Our Davy Crockett warhead weighed in at about ninety to a hundred ten pounds, without it's tail. You (well, I don't know you, but you know what I mean) could backpack a hundred pounds. I've done it, I could probably pack 150 for a couple miles. A fit, trained soldier can pack more. I don't think the "suitcase" nuke has a carry handle for a one-hand haul, IMO.
Innit inaressting that all these terror threats involve Soviet nukes, and never Davy Crockett, SADM, W54 or any of OUR stuff? Nobody shows up with a NIKE warhead, befor the days of PALs and day codes et al?