<human>: Ok so of course this hasn't happened today (I seem to be doing alright in the present day on the fucking-up front). 

This happened when I was 10 years old. As a young lad I loved fire. I generally was responsible about playing with it. I would melt toys together, and use a magnifying glass to burn images into my grandparents back porch, etc etc. So anyways, this one weekend I am visiting my older brother at his place. Spending the weekend there, playing video games. He smokes, and has a lighter. I also enjoyed taking things apart... so I took apart the top of his lighter. I then realized that you could turn the tiny valve under the gas release, thus making the flame larger. I jacked that flame way up so when you lit the lighter it was like a mini flamethrower! Now here is the fuck up... I forgot about it. About a half hour passes and we are heading out to the store. As soon as we step outside, big brother pulls out a smoke, and low and behold... the lighter. I am completely oblivious and still have forgotten all about it, then boom! His hair goes up in flames. Oh boy... he smacked me so hard in the back of the head... he still brings it up to this day, but we just laugh about it at this point. I was lucky and he didn't get hurt or anything... Just had to go for an emergency hair cut.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: When I was 10 I tweaked my older brothers lighter to breathe like a dragon. He lit a cigarette and his hair went up in flames.