Drills can screw you up fast!
When I was in shop class in high school,our teacher had me drill a series of holes in a steel workbench so we could knock out a 4" hole,so we could bolt lawnmower engines to the bench to make it easier to work on them and start them up after reassembly(why he didn't just let me use the cutting torches a few feet away is a mystery!)...so I went to the "tool crib" and got a huge Rockwell industrial 1/2" drill that had big 1/2" pipes for handles,and procedded to drill the 30+ holes in a circle...
Well,after 10 holes my arms were sore--and it was mostly because I was holding the trigger switch on while trying to control the drill with mostly one arm--so I "locked" the trigger in the "on" position,and now I could use both arms to bear down--much better!---UNTIL!--the 1/2" drill bit got stuck when it broke thru the 1/4" plate on the tabletop--
The torque of the drill was so strong it took my 130 lb body and threw me off the table onto the floor about 5 feet away!

---and the drill,still locked in the "on" position,spun wildly,until the 100ft etxention cord was wrapped around it like spagetti on a fork,and it yanked the cord out of the outlet way across the other side of the shop--it knocked over a "gunk" tank and made a huge mess!..

--the teacher came running over,and asked me if I was hurt--...
I had a good gash in my leg from catching it on a sharp metal peice on the table as I fell!!--then he yells at me for locking the trigger on the drill!...So I told him "its YOUR fault for telling me to DRILL 30 holes,instead of using the RIGHT tools--a CUTTING TORCH!!--OR A HOLE SAW!" --and I told him to go--"F" himself!--he sent me to the school nurse--while I was there she got a phone call--it was my teacher,telling her to send me to the headmasters office after my gash was bandaged!

--he didn't say much to me,other than I shouldn't have said what I did--he felt bad I got hurt,and agreed the method of cutting the hole wasn't the best way to do it!--
Sometimes I wonder why anyone WANTS to work on machinery and cars,when all you do is get injured most of the time??...
