1. Gunshot to the head (99,7% effective, dead in 1 min 30 seconds on average)
2. Hanging (99% effective, dead in 1 min 15 seconds on average)
3. Stabbing in the chest (98,4% effective, dead in 5 minutes on average)
4. Drowning (96,2% effective, dead in 12 min 25 seconds on average)
5. Overdose on drugs (90% effective, dead in 1 to 4 hours)
6. Jumping off a 100 ft building (87,3% effective, dead in 55 seconds on average)
7. Jumping into a big fire (84,8% effective, dead in 2 min 15 seconds on average instant, can take up to a day to 2 weeks if you get into hospital)
Bonus: Decapitation (99,9999999% effective, dead in 25 seconds on average, but very hard to pull off because of the thickness and toughness of your neck)