So I guess the obvious answer is some random shovelware 2600 game that barely works, so that’s not much fun. In terms of games that have some traction and nostalgia, I can think of a couple that just don’t do it for me. YMMV.
Contra is more of a beatdown than an enjoyable challenge, the konami code is iconic for a reason.
Defender is inscrutable and overambitious and the control are a weird early take on the side scrolling shooter.
Most arcade driving games were (and are) quarter eaters that aren’t trying to do much that’s interesting once you’re behind the wheel.