My father, as a forensic consulting engineer, spent a lot of his career giving evidence on technical issues in court. I can remember him saying that Marisa Tomei as Mona Lisa Vito's peformance as an expert witness (above) was vaguely credible as well as hilarious.
It seems he is not the only professional to appreciate it:
It was a quarter-century ago yesterday when the movie My Cousin Vinny made its debut in theatres. Over time, the comedy and its leather-jacketed, smart-alec hero, played by Joe Pesci, have swaggered into the pantheon of legal cinema, taking a seat alongside the genre’s dramatic greats, 12 Angry Men and To Kill a Mockingbird.
Judges have referenced it in rulings more than two dozen times. Just this month, “Vinny” made a cameo in an opinion written by US Circuit judge Janice Rogers Brown in Washington DC. Lawyers talk about the movie with a Casablanca-like fondness. Professors at elite law schools have invited “Vinny” into their classrooms, using the film as a teaching tool for courses in evidence and trial advocacy.