I was doing some work at a church that entailed cutting off some door bottoms to accomodate new carpeting. The church contact that hired me asked me to use his son as a helper both to reduce the costs and to teach the kid something about construction. This kid is about 16 YO.
He is a pretty industrious and a good worker, just clueless about construction.
When it came time for me to cut off the door bottoms, I set up my saw horses and laid some carpet across them to save the finish. I sent him out to my truck to get a new blade for my circular saw. While he was gone, I laid the first door up and marked my line. I took out my utility knife and began scoring the cut line when he walked into the room. He stood there watching me for a minute, then laughed.
I looked up and he said: "Man,...use the skilsaw to cut those off, that knife will take all day!"