Without elaborating on these spectacles overmuch, my causal research indicated that lime green was the favorite Jello color. Obviously, the Jello is rendered inedible during the process.
Some contests involve eating as an activity, such as being the one to consume the most hot dogs in a short period of time. These gluttony events are cheered by crowds, even when one or more of the contestants loses his lunch! Grrr-ross!
Some Tennessee guys apparently developed a sport called "butt-chugging," in which wine is taken in anally to induce intoxication. This is a health-risky activity.
More adventurous people go in for bungee jumping and sky diving. An old-style entertainment was the demolition derby competitions, in which drivers drive barely running cars in a field and deliberately crash into each other until only one car and driver is left in the competition. However, the Medieval sport of jousting is a direct ancestor of this. Maryland even declared it to be the official state sport! Of course, the pageantry and the colorful costumes lend it an aura of respectability, I suppose.
Is there any chance that some state will adopt Jello wrestling as its state sport? Probably not the states represented in the Southeastern Conference.