The answer is simple. Motorbike racing. Formula 1 and car racing in general follow the same trend, which is one long line of cars following each other round for countless laps with maybe the odd overtake and crash. most cars are too large to over take each other on the more technical tracks.
Motorcycles on the other hand are small enough to over take each other in the middle of a corner while almost horizontal. Its very fast, very dangerous and very entertaining.
Motogp for example has had some nail biting finishes in recent races much like the final race of last years F1. Unlike F1 however this is a regular occurrence in the GP. There are more crashes and as you would expect the bike crashes are more spectacular too
Now im a man who loves cars too and basically any sort of engineering. So while i do love motorbikes i would love to see some car racing as intense as the bikes but at the moment its just not happening