Best Henchmen ever?

Marty Feldman's Igor from Young Frankenstein.

Hump? What hump?

I'm thinking you're stacking the deck for Jaws by disallowing other entries. 

But the true answer is Darth Vader.

Mongo, 'Blazing Saddles'.

In the second, he kills his teacher, captures his daughter, tries to kill his son, and is the only one who survives the destruction of a robot planet.

He then cuts his own son's hand off, then sells his son's best friend to a bounty hunter.

In his last scene, he kills his boss by tossing him down a shaft...

Darth Maul didn't make it through one movie, neither did Mongo (how can you be a villain when you love candy grams?). All the 007 henchmen were brainless and obedient to their boss...

It's all about Darth Vader...

Yeah, but Mongo knocks the crap out of a horse and has a pretty awesome scene with beans.

PLUS, he realize that he is just pawn in game of life.

I was going to discredit Darth Vader because he truly is the main "bad guy".  In fact, probably the best bad guy of all time.  But 'tuwood' is simply right in this case.  He really is a henchman.  Totally loyal to the Emperor (up until the end), obedient, and merciless.

My list:

1.  Darth Vader

A distint next top-ten...

2.  The Joker (The Dark Knight) - IF you consider him a henchman to Sal Maroni
3.  Vincent Vega & Jules Winnfeld (Pulp Fiction)
4.  Agent Smith (The Matrix)
5.  Captain Byron Hadley (Shawshank Redemption)
6.  Luca Brasi (The Godfather)
7.  Colonel Hans Landa (Inglorious Basterds)
8.  Mystique/Raven (X-Men)
9.  Mr. Joshua (Lethal Weapon)
10. Bellatrix LeStrange (Harry Potter)

From his Wikipedia site:  http://en.wikipedia.org/wiki/Luca_Brasi

Biography

In The Godfather, Luca Brasi was a feared personal enforcer for the Corleone family, known as one of the most dangerous men in the eastern underworld. Fluent in Italian and able to handle himself in any fight, he had a dark reputation among the underworld as a savage killer.

Brasi's talent, it was said, was that he could do a job, or murder all by himself, without confederates or backup who might rat him out. Since Luca made sure to leave no witnesses either, this made a criminal conviction almost impossible. He is also known for killing, in two weeks, six men who attempted to kill Don Corleone. One of their men had managed to put the Don in the hospital, which prompted Luca's killing spree, and he might have continued had Vito not recovered enough to call him off. These six deaths ended the famous "Olive Oil War." His almost fanatical loyalty to Don Corleone was unquestioned, and he was said to have killed a Corleone soldier just for making the Corleone family look bad. Brasi often claimed that he'd sooner kill himself than betray the Godfather. Since Vito was the only one who could make Brasi stop a killing spree, this made the Godfather a far more risky Don to attempt killing than the others.

Another early incident involved Brasi killing off two of Al Capone's henchmen hired to kill Don Corleone. Brasi subdued both of them and tied and gagged them with towels stuffed in their mouths. He then hacked one of them to pieces with an axe. When he went to finish off the other one, he found that the man had gone through a shock convulsion and choked to death on the towel.

Later in the novel, Michael learns that, years earlier, Brasi had impregnated a young Irish prostitute and later murdered her. On the day of his daughter's birth, he forced the midwife, under pain of death, to hurl the child into a furnace, an act for which she never forgave herself. The midwife, who describes Brasi as an unholy demon, went to Don Corleone for protection, and he covered up Brasi's crime. With this, the Don earned Brasi's undying service and loyalty.

Does that qualify him as a henchman? 

Oscar Acosta

were it not for him, we might never have discovered Bat Country, and the American Dream would really be a smoldering pile.