How to kill an enemy politely ?

no probably you should kill them silently

There's only one thing to do -- look him in the eye, nod politely, and KILL THE LIVING CRAP OUT OF HIM!

If Tina said it, it must be true.

Edit - Also, whatever you say, do it with a British accent.

Either you say "May I please shoot you?" or you invite them to tea and poison their drink.

sniper to the back of the head, 0 fucks given

While sleeping, with fast effecting poison (needle type). Therefore he never gets any pain (as we know of at least) and still saves dignity with no blood. Polite and peacefully, you have killed your enemy.

you politely cut their head with a chainsaw.

Would you hold still, please sir?

"Hello, it's nice to meet you. Would you be so kind as to hold this grenade for me? Thank you so much." backing away slowly "And don't worry about the missing pin, it came that way" backing farther away "If you would excuse me, I think my contact lens fell out over here. Behind this thick brick wall." dives behind wall before explosion

Leave a letter on the floor. were on the letter is written "I'm reallt soory". Then just kill them from behind fast so the pain is not so great. And they die as fast as possible.

Start with "Beggin your pardon, sir, but to obtain the precious medicine you are carrying I am forced to shoot you and your robotic companions with this very Maliwan corrosive SMG; no other weapon is classy enough for you. " and then empty the clip in their faces

I like to kill them softly...from a distance.

You make a Barbeque with him. When it's over and he sleeps, you put the grill into his room and close the window and door. He will die in sleep, filled with meat and beer. :)

The first thing that came to mind when I saw this thread was a scene in the beginning of the film Serenity. After searching around, I simply haven't been able to find a decent, intact clip of it, so this is the best I could do:

The Operative: You know, in certain ‘older’ civilized cultures, when men failed as entirely as you have, they would throw themselves on their swords.
Dr. Mathias: Well, unfortunately, I forgot to bring a sword.
Dr. Mathias: [as the Operative pulls out his sword] I would put that down right now if I were you.
The Operative: Would you be killed in your sleep, like an ailing pet?
[Fight ensues. Dr. Mathias attempts escape. The Operative paralyzes him and then places the sword so he can fall on it. After he falls on the sword, before he dies.]
The Operative: This is a good death. There’s no shame in this. In a man’s death, a man who has done fine works.

As an aside, I'm not interested in the giveaway (thank you, though!), I just wanted to add this.

Approach your enemy directly. Challenge them to a fair and even fight. One on one. Unmodified revolvers, no shields. Give them a dignified death. Make them feel that they had a chance. If they attempt to subvert or reject your hospitality in any way, a quick sniper round to the head will put them in their place without being crass.

Challenge them all to take on the cinnamon challenge. Then watch with glee as the robots explode and the human chokes to death.

Death by snu snu.

I'd write sorry on the bullets :P

say sorry and thank you before you chop their head off with a flaming chainsaw enchanted with black magic in 3D.

Click on them, then press shift + delete. Bonus points if you do it fast enough for them not to notice in time.

This is the only way I know how to kill people politely.

invite them to a tea party, put acid on your tea and launch them to their faces

I would ask my enemies how they want to die assuming they will not have a natural death and I will kill them that way. It's polite after all they were the ones that told me how they want to die. :)

Get to a height, and then fire this at them. Voila! :D

Use Cortexiphan !