I remember one time, my family was out for a family outing, and we stopped to throw rocks in river. The bank of the river was about 15' above the edge of the water. My sons were about 3, 5, & 7 years old, at that time. I don't remember the reason I decided to climb down to the edge of the water, but I did. My 3 year old didn't realize I had climbed down, picked up the biggest rock he could hold (probably the size of a soft-ball), and tried to chuck it into the river. It landed square on the top of my head. I was livid. Fortunately, climbing back up the bank took enough time that I had cooled off before I got to him. That boy is 9 now, and he still laughs at me for the time he got away with beaning me in the head with a rock. lol.
Do you let him drive your truck?