I know it isn't technically an arcade game, but I'm shocked that no one has mentioned Duck Hunt yet. NOTHING, and I mean NOTHING impresses people more then Duck Hunt in my PC10 duel monitor! I always have a namco Pac Man cart in my Sharp NES, and have my MK2 and SF2CE and Simpsons fired up, but as soon as people see and hear Duck Hunt, it's over!
I would assume that if someone were to have all cabinets, the ones that would be most popular to a large group of people would be Pac Man/Ms Pac Man, competitive sit down drives (especially the Cruisn series) and then NBA Jam and Mortal Kombat.
I know that the golden age games are popular on here, but unless the person is 45+, the majority of them won't appeal to them, with the expection being Pac Man.