<human>: NOTE: This happened 2 years ago.

So I had this bad habit for years when I just bite my nails when I get nervous, and for some reason I always do it.

Well fast forward to today, my 2 good friends and I are working on building a new balcony and I am installing wood near the balcony while on a ladder, my friend is hammering, and another friend is "testing" the balcony by sitting on it with his PC. Well after a while my friend asks me to stand still, while keeping in place a plank currently holding the whole thing up while he installs another one and brings cement. So after a while I started getting tired and my hands shook, I got very scared a started to bite my nails, but the way I was holding the plank I couldn't do it, so being very stupid I let go of the plank and **HOLY SHIT**, the balcony collapses and literally my friend flies down and I hear a snap, he broke his foot, and his PC setup worth $450 got obliterated. However what made it worse is the the wire twisted and the electrical outlet "exploded", by this I mean sparks flew everywhere and for some reason the power went out. But as I am seeing this happening in slow-mo, the balcony is falling on me, and at this moment I see a bucket with cement and put it over my head as the planks fall on me. By the evening my friend lost $450 on his PC, broke his leg, our house got a damaged electrical system since some wires got yanked, and out balcony was destroyed. However 7 months later it was rebuilt by us, so everyone gets a happy end.

Provide a brief overview of the text.
<bot>: Building a balcony while a friend was playing PC games, Bit my nails, and the balcony collapsed which led to my friend breaking his leg, getting his PC smashed, and our house loosing electricity for 2 days.