There was one called Tent Tumble (well 2 of them) underground events held in Vancouver in a big circus tent. I have not seen these but apparently guys were kicking and stomping with workboots on, one guy lost a kidney, one of the main events was 2 guys who had a series going that started when they were in prison, etc.
Sounds pretty wild.
A lot of the Vale Tudo events at least have no biting or eye gouges. I think it was at one of the Japan Vale Tudos that Gerard Gordeau (first guy to win a UFC match) blinded a fighter in that eye with a gouge.
Remember in VT there are no time limits or standups so a match could be some hour long lay & pray as easily as some vicious brawl.
If biting was allowed that would be the end of the triangle choke.
I like both MMA and more extreme, older fight footage(as well as streetfight stuff), just for different reasons. Actually I prefer Pride rules (well, the Japanese rules) to anything, think they allow for the most entertaining fights, more so than any promotion past or present, and also demand skill and gameplans. For instance compared with the UFC you can actually take advantage of a grounded opponent rather than having to enter his guard, there are no elbows so it is harder for someone to win on a technicality cut stoppage, etc.