I once accidentally
cd /usr/local/
wget something.tar.gz
untar something.tar.gz
mv /usr/* /usr/local # I meant usr/*
I once tried to make a program to decode SVG files, and I assumed it would be really slow, so I left it decoding a really simple one at home while I ran some errands. I also accidentally wrote it to repeat infinitely. it was also a lot faster than I expected.
It used up an entire 128gig USB.
Made a mouse recording program that records all your mouse moves. Forgot to delete the last action on the list so it kept clicking play. The mouse moved so fast I couldn't do anything, then finally I did Crtl-Alt-Delete (After half an hour since I forgot about it) and shut down the program.
Once, when I was 8, or something, I was walking around the house, and me being the blind guy I was (and still am) i tripped on a rug and slammed my head straight into the heater. (and it wasn't light, I went airborne for a second then hit it straight on one of the bars of a radiator)
My parents took me to the hospital where I was stiched up. I still have a pretty nasty scar on the top-left side of my head.
I'm blind, too. Once I was strolling along the shore with my older sister and suddenly she shouts 'WATCH OUT!'
I didn't know what so I kept looking around for a minute or so...until I noticed a GIANT DEAD CRAB a couple centimetres away from my foot which I was going to step on subconsiously!