Not of my SI. My own stupidness. I cut my throat, 5 times but the only knive what I got, was so unsharp that I could not cut deep enough. At that time I had no internet access, no books or any other information, I did not know how to make a hangman knot and how to sharp a knive. So it was the only what I had. At least I could overcome SI relatively easy.
The joke is I have now much more knowledge, money, materials, softy methods and even know how to theoretical make cyanide but cannot overcome SI anymore.