I learned how to twist a viewport not because I wanted to, but because I received a drawing with a twisted viewport and could not figure out what the deal was. In model space everything was rotated about 30 degrees and in paper space it all sat straight.
So here is how to do it. In Paper space type "Dview". When prompted for an option type "tw" for twist. Then try "90" for the twist angle. Hit "enter" twice to exit the command. The results are shown below.
This might help where you have a true North but prefer to work at drawing North, who know, but I sure enjoy twisting just for fun.