I can see getting 140, probably not for me at this point. However, I scored a really bad 112 (71.6/133), recently, due to lots of OB and making swing adjustments during the round. I don't really see too much difference between a 112 (for me) and a 140 (for a beginner). It just means I made a few more good shots/putts more during the round.
My first round ever was only 108 (my daughter scored me 2.5 years ago, so I think it was by the rules) at Brookside in Pasadena course 2 from the white tees, my coach at the time was disappointed. I was pretty happy just to make it through the round. My lowest score ever, was an 89 on the same course and tees with my highest in the 120s.
If you are making adjustments to your swing and/or have fluctuations in distance from round to round I can see getting 120s or even a 140 on a difficult course.
It couldn't hurt for the OP to help his friend with fundamentals by watching him swing. If I had a buddy who would watch me while I practice and let me know what is grossly wrong, I would really appreciate it. Approach your buddy with some tact and grace and smoothly transition to watching him and letting him know what might be grossly off.
Good Luck to the OP.