1) He was the UFC 17 tournament champion
With only two professional fights and a year of MMA training under his belt, Henderson would make his octagon debut at UFC 17. From there he would defeat Alan Goes and Carlos Newton to capture middleweight tournament championship. Unfortunatley for UFC fans, Hendo would soon leave and take his talents to Japan until his promotional return at UFC 75.
2) He's apparently found the fountain of youth
If you would have said back in 1998 at UFC 17 that Dan Henderson would still be competing 15 years later and would be a top tier fighter , you would probably be called a fool. And if you did say that, well then you are probably the second coming of Nostradamus. At the age of 42, when most men are too tired to even get off the couch, Henderson is still fighting and doing to so at a very high level. Hell, since turning 40 the guy has won a title, defeated Fedor, and fought in one of the greatest UFC fights in history with Shogun Rua. In fact, Hendo is currently the oldest active UFC fighter. As Randy Couture would say "Not bad for an old man".
3) His chin is made of adamantium
In 38 professional bouts, Hendo has never ever been knocked out. Which is more impressive when you consider he's fought assassins like Vitor Belfort, Rafael Cavalcante, Rampage Jackson, and Fedor Emelianenko. Not even Wanderlei Silva in his beserker Pride form could get the KO against Dan.
4) He's a champion hunter
If you look at Hendo's resume, one this is for sure. He's beaten a lot of champions in his time. In all, he's defeated a total of 10 former UFC, Pride, and Strikeforce champions.
5) He's tasted gold everywhere but the UFC
While he's held the Pride middleweight, Pride welterweight, and Strikeforce light-heavyweight titles, Henderson has actually never won a strap in the UFC. Dan is actually 0-2 in UFC championship fights, having lost back-to-back bouts to "Rampage" Jackson(UFC 75) and Anderson Silva(UFC 82).
6) He's an extremely decorated wrestler
Before making his name in the cage and the ring, Henderson was a elite level amateur wrestler for both Cal State Fullerton and Arizona State University. Aside from medalling in the Greco-Roman wrestling Pan American and World Cup championships, Hendo has also repped the U.S. in the 1992 and 1996 summer Olympics.
7) He was one of the founders of Team Quest
In 1999, along with fellow amateur wrestlers/fighters Randy Couture and Matt Lindland, Henderson would help form one MMA's most proven teams in Team Quest. Long before the Blackzilians and Jacksons, Team Quest was the place to train. The team attracted many accoladed wrestlers looking to break into MMA including Chael Sonnen and Joe Warren. Today the Gym has gone on to expand all over with locations in Oregon, California, and even Thailand.
8)He fought "Shogun" Rua in one of the greatest fights ever seen
Sure, we all know that Stephan Bonnar vs. Forrest Griffin was the most important battle in MMA history, however in my opinion there is no better fight than Hendo's epic war with Shogun Rua. Surprisingly Henderson and Rua never had the opportunity to face each other back in Pride, but damn did they made up for it at UFC 139. For 5-hellish rounds, the two exchanged everything they had and somehow kept moving forward. The fight had it all, from violent exchanges to near finishes. In the end it was Henderson with his arm raised after a unanimous decision, but in reality it trully felt like there were no losers. If you haven't seen this fight, you need to find a way to watch it right now.
9) He's no longer decision Dan
Before he was known for lethal right hand, Henderson was known "Decision Dan". It was unfortunate nickname for such a trully great fighter, but the fact of the matter is that throughout his career Hendo has racked up quite the number of decisions. In 38 professional contests, Henderson has gone to the judges 20 times. As of late however, we have fortunaltley come to know him as the master of "H-bomb" and collecter of KOs. In his last 5 wins, Dan has amassed 4 KO/TKOs including...
10) He's responsible for perhaps the greatest KO/meme in UFC history
If you're MMA fan then you already know Henderson's greatest KO is also probably the best in MMA history. There are no amount of words that can describe the beautiful destruction that was his bout with Michael Bisping at UFC 100, so i'll just leave you with this GIF.
The decapitation would also leave us with memorable memes such as this classic.