You're going to die.

[GuideBot]

Desert Eagle .50 Action Express. Back of the Head. Like a Watermelon.

You mean something like this
http://poetry.rotten.com/failed-mission/
Warning some might find this image extremely disturbing

Jeebus. That's pretty gross.

At least this way its over in an instant; I'd not have to worry about these side effects.

 

[Paksenarrion]

By my own hands.

...because my evil clone (or is she the good one?) fights me to the death with lightsabers.

 

[Carlan]

A lethal dose of heroine perhaps. Chemically induced bliss is still bliss, but lethal doses mean I don't have to deal with the messy consequences.

 

[DiMono]

Protecting a loved one, though I'd rather it not come to that.

 

[Naleh]

Doing something incredible.

Part of a crew on a one-way mission to Mars, for example.

 

[Delta 3 Actual]

orgy.