I was 16. I drank roughly half a 750 ml bottle of vodka, because my dad told me to go kill myself when he saw my grades in math class. He told me the amount of alcohol I would need to drink for my body weight (less than 100 pounds), in order to get lethal alcohol poisoning. He then brought a bottle of vodka out, put it on the counter, and went to bed. My mom heard the entire exchange and didn't think it would lead to anything serious, so she didn't even bother to see what was happening. I was still doing well in school in the grand scheme of things but not good enough for my parents to think that I deserved to be alive, apparently.
I decided to go above and beyond, like I was always expected to at everything I did. I tried to drink the entire bottle straight and ended up puking uncontrollably once I got about halfway through. Probably about half of what I drank was actually retained, based on how drunk I felt (I was regularly binge drinking at the time). I still had to go to school the next day and just pretend that nothing happened. It wasn't like anyone at school would have cared anyways.
I obviously failed to CTB, because I puked.
I tried a similar method a year later with vodka and a month's supply of Ativan. This time I took Gravol beforehand. Before trying to CTB, I decided to eat something that I was always too scared to eat (chronic ED, long story), then waited 6 hours for it to digest so that my stomach would be empty. I took Gravol and waited about 30 minutes. Then I took the Ativan and drank the vodka. Obviously, I failed again. This time it was because I apparently walked into my brother's room saying that I was going to die, then collapsed on the floor. I started puking before paramedics arrived and took me to the hospital.