Sam was a second-half replacement for Mike Blair and the Glasgow scrum-half couldn't have hoped for a better start. Fellow-Warrior Donnie Macadyen sent Sam in for a score with his first touch of the ball in his first appearance for Scotland.
Andy Henderson also weighed in with two tries in a confidence boosting performance for Scotland before they leave for South Africa on Sunday.
There were also good performances by Scott Lawson and Dan Parks - the stand-off's pass for the arcus Di Rollo try was the classiest piece of skill shown all night. It was great to see Donnie Macfadyen back in a Scotland jersey after so long out through injury.
Glasgow's Kevin Tkachuk started for the Barbarians and made his presence felt with a few big hits, with one in particluar on fellow-Warrior Andy Henderson. Kevin - in Glasgow socks, of course - almost capped his first Barbarians appearance with a try but the ball was knocked from his grasp just as he seemed set to touch down after a typical T-Bone drive.