TIFU when I lit my parents' bathtub on fire...

So not really today, but a few years ago, I did this really dumb thing and even though it is not up-to-date anymore, I believe this is worth sharing for a bit of amusement:

(Backstory) When I was an 11th-grade high school student, I hated shopping for deodorants as I would have to go to a different store than where I got my weekly groceries because that one didn't have the kind I liked. So I always bought a few of these deodorant spray cans at once thus having supplies for 3-4 months before having to go buy new ones. At that time, I discovered a new kind of deodorant that smelled better and so I started buying that stuff, but I still had 2 full and one half-empty can of the old kind laying around. I thought of ways to get rid of them. They explicitly write (in german though) "Only dispose completely empty" on the back of the cans. I didn't want to just spray it out into nature, assuming it wouldn't be good for the environment.

(Prep-work) So I grab an old towel, open the big bathroom window, sit down in front of the bathtub and start spraying the deodorant from those cans into it, trying to catch as much of it in the fabric as possible. After a few minutes, I'm done and stand up. The room smells strongly like the deodorant but it wasn't too bad as the towel did exactly what I hoped for, catching the brunt of the spray.

(Me = idiotic child) A thought pops into my head: On the cans, they write that the stuff is flammable. Maybe I should test if I could light a short flame above the tub like how we did it with small amounts of hydrogen after splitting water in our chemistry classes. I get curious and grab a lighter from my room that I sometimes play with when I'm bored. I didn't expect much to happen. After all, most of the deodorant was going to be in the towel and the rest probably vented out of the open window already, right?.

(\CSGO Voice** MOLOTOV!) I flip the lighter as I stand in front of the bathtub. A HUGE flame shoots up against the wall and ceiling, and the room suddenly gets so hot, that my first reaction is to flee into the hallway and rip the door shut behind me. I stand there for half a second, realising what just happened and start panicking, then rush to grab a bucket, fill it with a bit of water in the kitchen and run back into the bathroom. The fire still burns, but as most of the gas burned away in a few seconds, the fire died down a bit. I throw the water into the bathtub, grab the water hose from the shower cabin next to it and start showering the entire bathtub with water (Don't ask me why we had a bathroom with both, my step-father rented that thing). I fully extinguish the fire and with my nerves blank, I call my mother on the phone, as they were not at home.

(Aftermath) We had drywalls as we lived in the renovated attic of a multi-family house. I was really lucky, that they did not catch fire and that all you could see was a bit of soot on the walls. I burned the towel in the bathtub, the edge of the cabinet next to the bathtub, as well as various items on top of it like toothbrushes and another towel. Fortunately, I had already taken out the empty cans with me when I left to grab the lighter. Otherwise, I might have had 3 hand grenades there with me additionally. I also burned a bit of my hair, my eyebrows, my arm hair and the bathrobe that I was wearing that consequential morning. Consequential, because I ended up sticking with the purchasing habit I developed earlier but switched to roll-on deodorant recently because my skin is more tolerant towards those. Now, I still have 3 and a half cans of old deodorant, as well as an almost full 6-Pack of newer cans (I ordered it shortly before the switch to roll-ons) which I will probably never use up, still laying around in my apartment. Either they kill me at some point or I stick with them for the rest of my life (I'm actually happy to accept any advice on how to get rid of them safely).

("Nah that must have been the suns' heat...") I didn't tell my family or friends what happened back then. Even now, only one of my two older sisters and a couple of very close friends know what actually happened. The rest, especially my mother and step-father with whom I had or have a lot of trouble, got to know what I was doing in the bathtub with the deodorant cans, but a lighter basically never existed. "It must have been the suns heat shining into the bathtub through the window that sparked the fire", I told them. My smart*ss stepfather even went so far as to assume it must have been the density of the molecules in the air that ended up self-igniting the gasses. The only person to actually get to know the full story back then was the therapist which I consulted at the time. We had a little laugh together. Had I told anyone else what actually happened back then, they might have sent me to a clinic, assuming I actively tried to burn the house down or kill myself.

I found this place recently and assumed it would be perfect for my story. I never told this openly before, although I once considered telling it on a live stream where one of my favourite streamers would pick people from his discord to ask questions or tell random stories. Maybe, I will do it at some point, depending on whether it is a good story in you many Redditors' opinion or not. I hope I could amuse you to some extent. Have a nice day.

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TL;DR I tried to empty deodorant cans in a towel in the bathtub before disposal and got curious to whether or how the gasses would light up as described on the cans. The answer was: 'yes and also f*ck' because the flame was a little bigger than what I had expected. Nobody was seriously hurt and there was no big property damage, luckily.