My favorite trick was to offset the pilots ADI by 10-15 degrees in roll and leave everything else alone. One will discern whether the guy with the sticks is flying "instruments" or the ADI and calling it "instrument" flying.
It is scary how many ignore the other two ADI's and other cues and continue to flounder about chasing a zero turn datum.
Unusual attitudes can occur for a host of reasons and maybe not with any great big red flags showing anywhere.