Since his early fights in the UFC against Guy Mezger and Jerry Bohlander, Tito Ortiz and The Lion's Den never got along.
Mostly, it started when Tito Ortiz defeated Mezger in a rematch and sported a t-shirt that read "Gay Mezger is my bitch" while still in the ring.
Lion's Den leader Ken Shamrock did not take kindly to this disrespect, and the rest is history.
For years, both Ortiz and Shamrock criticized each other in interviews or basically any chance they got. But it wasn't until three years after the Mezger fight that the two would meet in the cage for the first time.
The trash talk was heated leading up to the bout, but after Ortiz beat Shamrock down for three rounds, the two squashed the rivalry in the ring.
Of course, that didn't last long.
A few years later, The UFC announced that Shamrock and Ortiz would take roles as opposing coaches on the third season of The Ultimate Fighter.
The two were in each other's faces for the entire season with some of the most personal and critical trash talk ever heard in sports.
Ortiz would stop Shamrock two more times following the conclusion of the show.
Both fighters still openly insult each other every chance they get.