noose
A knot that is underappreciated by many. It is often only associated with committing suicide and depression when it is actually a very useful knot for various other reasons. Having the noose tying skills of a professional, I would recommend anyone to learn how to tie this knot regardless of whether or not they are suicidal.
Example:
Person 1: I'm going to tie a noose.
Person 2: But you have so much to live for!
Person 1: Sorry for worrying you, but I am actually tying this noose for fishing and boating purposes.
Person 2: Ah, I see! Nooses are very useful for that sort of thing.
Person 1: Want to go fishing with me? I can teach you how to tie a noose while we're there.
Person 2: Sure, that sounds great.
Person 1: I'm going to tie a noose.
Person 2: But you have so much to live for!
Person 1: Sorry for worrying you, but I am actually tying this noose for fishing and boating purposes.
Person 2: Ah, I see! Nooses are very useful for that sort of thing.
Person 1: Want to go fishing with me? I can teach you how to tie a noose while we're there.
Person 2: Sure, that sounds great.